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The beautiful castles of Wales: Caldicot Castle: Caldicot Castle in South Wales dates back to 1221. Today, it's a striking ruin rising out of the countryside. Click through for shots of more stunning Welsh castles.
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Raglan Castle: Is Raglan Castle Wales's most opulent castle? This medieval gem was once home to an incredible art collection and picturesque gardens.
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Cardigan Castle: Cardigan Castle is situated on the River Teifi. Back in 1176, it was at Cardigan that the first National Eisteddfod -- a gathering of musicians and poets -- was held.
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Carew Castle: On the Welsh Pembrokeshire coast, the current Carew Castle dates back to the 11th century, although it's believed to have been a military outpost for some 2,000 years.
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Castell Dinas Bran: This ruined castle near Llangollen in Denbighshire, dating back to the 1260s, offers incredible views of the surrounding area.
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Castell y Bere: Nestled in the peaks of Snowdonia, this castle was built by Llewelyn the Great in 1221.
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Chirk Castle: On the border between England and Wales, this grand castle went on to become a stately home and is now a visitor attraction.
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Cilgerran Castle: Perched high above the Teifi gorge in Pembrokeshire, this striking fortress remains a remarkable sight.
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Dinefwr Castle: Once the heart of the medieval Welsh kingdom of Deheubarth, this castle later came under English rule in 1287. Now it's a great spot for deer and bird-watching.
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Kidwelly Castle: You might recognize this Norman castle from 20th century comedy movie "Monty Python and The Holy Grail."
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Laugharne Castle: This fairy-tale-esque spot in Carmathenshire inspired the work of Welsh poet Dylan Thomas.
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Harlech Castle: On the shores of Cardigan Bay, this turreted castle played a key role in Welsh history in 1404, when it was seized by Welsh rebels led by Owain Glyndwr.
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Llansteffan Castle: Located in Carmarthenshire, there's been a castle here since an Iron Age fort was built in roughly 600 BCE.
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Criccieth Castle: Built by Llywelyn the Great on the south coast of the Llyn Peninsula, the castle still cuts an impressive figure.
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Conwy Castle: Part of a UNESCO World Heritage Site, this astonishing castle was built over a four-year period in the 1280s and is still standing strong.
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Pembroke Castle: First constructed by Anglo-Norman noble Arnulf de Montgomery in 1093, the current castle dates back to the 12th and 13th century.
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Caernarfon Castle: Watch out for this castle in the third series of "The Crown" on Netflix -- it's where Prince Charles was formally invested as Prince of Wales in 1969.
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Skenfrith Castle: This Monmouthshire castle has been a ruin since the 1500s.
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White Castle: This castle is one of three -- alongside Skenfrith and Grosmount -- that was built by the Normans to protect the route into Wales from England. It's now an impressive ruin.
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Caerphilly Castle: Welcome to the second largest castle in Britain, only coming second to the royal castle of Windsor.
© Hawlfraint y Goron / © Crown copyright (2019) Cymru Wales
Beaumaris Castle: Work started on this castle in 1295, but by the 1300s it was pretty much abandoned. Regardless, it's still an impressive spot today.
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Castell Coch: There's been a fortress of some kind in this spot for some 900 years, but it was in the 19th century that Castell Coch got a Gothic revival makeover, making it the castle it is today.
Mike George/© Hawlfraint y Goron / © Crown copyright (2019) Cymru Wales
Chepstow Castle: Standing over the River Wye, Chepstow Castle dates back to the Norman conquest.
© Hawlfraint y Goron / © Crown copyright (2019) Cymru Wales
Cardiff Castle: A city-center castle built on earlier Roman foundations, today Cardiff Castle is a highlight of the city's tourism scene.
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Powis Castle: Welsh prince Gruffydd ap Gwenwynwyn built Powis Castle near the town of Welshpool in the 1280s.
CNN  — 

Wales is home to more castles per square mile than anywhere on the planet, with over 600 found across this tiny, beautiful country.

Each has its own long history, with many dating back to the medieval period.

As the third series of “The Crown” arrives on Netflix, including the investiture of the Prince of Wales at Caernarfon Castle in 1969, now is the time to explore these Welsh treasures.

From vertiginous hillside ruins to city center gems, here’s our pick of the most beautiful castles in Wales to see when you travel there.

Caernarfon Castle

© Hawlfraint y Goron / © Crown copyright (2019) Cymru Wales
Prince Charles's investiture as the Prince of Wales took place at Caernarfon Castle.

Caernarfon is arguably the most spectacular castle in Wales.

Work began on the current stone wall structure in 1283 and wasn’t completed until 1330, although Roman fortifications were built here as far back as 77 CE.

Built by King Edward I, its immense and imposing towers sit on the River Seoint and the Menai Strat, overlooking the island of Anglesey.

The first modern Prince of Wales, who would later become Edward II, was born here in 1284.

Prince Charles’ investiture as Prince of Wales took place at Caernarfon in 1969, a defining moment for the modern British monarchy.

Conwy Castle

© Hawlfraint y Goron / © Crown copyright (2019) Cymru Wales
Conwy Castle is part of a UNESCO World Heritage site.

Along with the castles at Caernarfon, Harlech and Beaumaris, Conwy is part of a wide-ranging UNESCO World Heritage Site.

The castle here was built in just four years, between 1283 and 1287, all the more impressive when you stand atop its battlements and consider how it still stands tall over 700 years later.

The views across to the peaks of Snowdonia and over the unbroken medieval town walls are a worthwhile reward for braving its narrow spiral staircases.

Caerphilly Castle

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Caerphilly is the UK's second largest castle.

Caerphilly is the second largest castle in Britain, covering some 30 acres – only the royal seat of Windsor is bigger.

Work was started on this vast fortress in 1268 by Gilbert de Clare, an English nobleman determined to colonize the surrounding area of Glamorgan and see off the challenge of Llywelyn Ap Gruffudd, Wales’s last sovereign prince before Edward I finally conquered the principality in 1283.

Having repelled Llywelyn, Caerphilly Castle became a palatial home, although its southeast tower was left leaning precariously after fighting during the 17th century English Civil War.

Harlech Castle

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Harlech Castle was built in the 13th century.

Harlech Castle stands on the shores of Cardigan Bay and is closely tied with the history of Welsh rebellion. Another of Edward I’s key fortifications, it was built in seven years, between 1282 and 1289.

However, its most famous hour came in 1404, when it fell to the forces of Welsh rebels led by Owain Glyndwr. The rebels held out until early 1409.

Today, the castle is accessible by a “floating footbridge” which links the visitor center to its original entrance.

Beaumaris, Anglesey

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Beaumaris's construction was abandoned due to lack of funds.

Beaumaris is known as the greatest castle that was never built. Conceived to stand alongside Caernarfon, Conwy and Harlech as outposts of English power in Wales, work was started by Edward I in 1295.

However, a lack of funds and fighting in Scotland meant that by the 1320s Beaumaris, meaning beautiful marsh, was essentially abandoned.

Today, its incredible, symmetrical design, made up of four concentric rings of fortifications and outer walls with more than 300 arrow loops, shows what might have been. Although it’s unfinished, this is still one of the finest castles in the world.

Cardiff Castle

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Cardiff Castle contains Roman and Norman fortifications.

Not all Welsh castles overlook windswept bays or stand atop distant mountains. In fact, Cardiff has one of the best in the country.

Standing right in the heart of the modern-day city, Norman invaders built a simple castle keep in the 11th century within Roman fortifications dating back to the third century.

New sections have been added and original parts remodeled ever since, including a spectacular redesign in the 19th century by John Crichton-Stuart, third Marquess of Bute and at one time reported to be the world’s richest man.

Chepstow Castle

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Chepstow Castle stands over the River Wye.

Set on limestone cliffs above the River Wye, Chepstow Castle dates back to 1067, when the Norman conquerors first laid the stone for what would become one of Wales’ most important castles.

Its riverside location made Chepstow one of the most strategically important strongholds in the country, allowing the Normans to launch a full-scale conquest of surrounding Gwent.

As the years passed it became less important in terms of defense, but remained a key seat of power.

Skenfrith Castle

Skenfrith might not stand tall or range across a vast number of acres, but this ruin in Monmouthshire is still one of Wales’ finest castles.

Said to have been built following the Norman Conquest of England in 1066, it was vital to securing a route into Wales from the town of Hereford.

Despite being key for Kings of England throughout the following centuries, by the 1500s it was a ruin. It wasn’t until the 20th century that it became a site of conservation.

Pembroke Castle

Initially built by Anglo-Norman noble Arnulf de Montgomery in 1093, the vast stone castle that still stands today was constructed in the late 12th and early 13th centuries by William Marshall, the First Earl of Pembroke.

At the center of sieges and battles between local Welsh rebels and conquering English kings in the following centuries, Pembroke Castle is also said to have been the birthplace of Henry VII, the first Tudor king of England, who assumed the throne in 1485.

Powis Castle

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Powis Castle stands near the town of Welshpool.

Built by the Welsh prince Gruffydd ap Gwenwynwyn in the 1280s, Powis Castle sits close to the town of Welshpool in the heart of Wales.

While its medieval roots are obvious, in truth Powis became even more important during the 18th and 19th centuries, when the estate became the property of the Clive family.

The Clives were at the forefront of the British conquest of India, with antiquities controversially taken by the family house in the castle’s Clive Museum.

Dinefwr Castle

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Dinefwr Castle sits on a hilltop in Carmarthenshire.

The heart of the medieval Welsh kingdom of Deheubarth, Dinefwr Castle stands high above the River Tywi.

It was rebuilt during the 12th century by the Lord Rhys, the kingdom’s ruler, who presided over a stable period during which culture in the region flourished.

Dinefwr eventually came under English rule in 1287.

The area is known for its wildlife, with 700-year-old trees providing shelter for deer and a wide range of birdlife.

Carew Castle

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Carew Castle on the Pembrokeshire coast.

This spectacular castle looks out across a vast tidal inlet.

It’s said to have been a key military outpost for as many as 2,000 years, although the current building dates to the late 11th century and the years after the Norman invasion of England and Wales.

It was also a key outpost during the reign of the Tudors in the 1500s, with the castle modified and updated before falling into ruin. It remains one of Wales’ most stunning buildings.

Cardigan Castle

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Cardigan hosted Wales's first ever national gathering of musicians and poets.

Cardigan holds a special place in Welsh history. Not only is it one of the finest examples of a Welsh castle, it was here in 1176 that the first National Eisteddfod, a gathering of musicians and poets, was held.

The event marked the completion of the castle by the Lord Rhys and has gone on to become a cornerstone of Welsh culture, still held each year.

Castell y Bere

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Castell y Bere was built to protect livestock.

Castell y Bere is a native Welsh castle like no other. Built by Llewelyn the Great in the glorious southern peaks of Snowdonia, construction started in 1221, in a bid to protect the southern edge of Gwynedd.

Once it was captured in the late 13th century by Edward I, the castle was abandoned. Today its ruins offer some of the finest views in the entire country, not to mention an insight into the strength of the Welsh princedoms which ruled this area.

Laugharne Castle

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Laugharne has inspired poets and artists.

The majestic Laugharne Castle was heavily fought over between Welsh and English forces battling for supremacy in this beautiful region of West Wales.

The castle was originally built to protect the Taf estuary in 1116, before it was destroyed and rebuilt following a series of bloody battles over the following centuries, right through to the English Civil War of the 1640s.

Its ruins inspired J. M. W. Turner and Laugharne’s most famous son, Dylan Thomas, who wrote poetry here.

Raglan Castle

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Raglan is one of Wales's most opulent castles.

Raglan is perhaps the most opulent castle in Wales. It was much later than most of the country’s medieval fortresses, with the hulking Great Tower constructed in 1435 by Sir William ap Thomas.

His son, William Herbert, was responsible for the stunning gatehouse.

During the Tudor years Raglan became more of a palace than a castle, with a huge art collection and beautiful gardens. Much of it was destroyed by parliamentary forces during the civil war after Royalists holed up inside during one of the conflict’s biggest sieges.

Caldicot Castle

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Caldicot Castle dates back to the 13th century.

Work on the present-day stone castle at Caldicot began in 1221, when the castle became the property of the Earl of Hereford, Humphrey de Bohun.

Prior to that, the castle had been a simple wood and earth structure.

The castle became the center of a lengthy tussle between the heirs of de Bohun and the English nobility, before eventually falling into disrepair. It wasn’t until 1885 that it was partly restored by Joseph Richard Cobb, becoming a palatial home.

Cilgerran Castle

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Cilgerran is perhaps the most striking castle in Wales.

Cilgerran Castle is perched high above the Teifi gorge.

In a country with improbably placed castles, it’s perhaps the most striking of the lot. Work on the stone fortress began in 1223, based on an existing earthwork structure, in a bid to prevent marauding local princes taking control of the castle and, by extension, the surrounding area.

The approach worked – the famous Welsh rebel Owain Glyndwr was unable to take Cilgerran.

Chirk Castle

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Chirk Castle has an imposing but simple style.

This beautifully maintained castle in the Welsh Marches, close to Wrexham, has an imposing but simple style.

Building work was finished in 1310 and it’s been inhabited ever since, passing through a series of noble families.

Initially constructed as one of several castles along the English border, designed to subdue the local population, Chirk went on to become a stately home full of antiques. It even served as a home for evacuees during World War II.

White Castle, Monmouthshire

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White Castle was orginally built by the Normans.

One of the “Three Castles,” along with Skenfrith and Grosmont, built by the Normans to protect the route into Wales from Hereford, the White Castle is said to have derived its name from the rendering on its walls.

Today it’s a ruin, albeit one that showcases how bigger castles in the north of the country would go on to look in the late 13th century.

Kidwelly Castle, Carmarthenshire

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Kidwelly is a "castle within a castle."

While a castle has stood on this site since the early years after the Norman invasion, it wasn’t until the 1280s that the current stone construction was built.

A “castle within a castle,” with an outer wall protecting four towers within, Kidwelly proved impossible for Welsh princes to capture. The castle gained cult fame in the 20th century after appearing in “Monty Python and The Holy Grail.”

Castell Coch, Cardiff

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Castell Coch is the work of celebrated Victorian architect William Burges.

While fortifications have stood here for the best part of 900 years, it wasn’t until the late 19th century that Castell Coch became the incredible building it is today.

Designed by William Burges on behalf of the third Marquess of Bute, this masterpiece of Gothic revivalism had its own vineyard and was one of the most spectacular stately homes of the period.

Castell Dinas Bran

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Castell Dinas Bran sits on a commanding hilltop in Denbighshire.

High above the town of Llangollen, Castell Dinas Bran is one of the most prominent castles in Wales.

Often translated as Crow’s Castle, the views it affords of the surrounding area made it an obvious location for a fort.

The current ruins were built by the area’s Welsh rulers in the 1260s, in a bid to repel English invaders.

The castle was destroyed by fire in the 1270s when English nobles attempted to capture it.

Llansteffan Castle

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Llansteffan can trace its origins back to an Iron Age fort.

With impressive views of the Tywi estuary and Carmarthen Bay, Llansteffan Castle can trace its origins back to an Iron Age fort built here around 600 BCE.

The twin towers of the gatehouse were built in the 1280s, with the castle fought over by Norman settlers and local princes until it eventually fell into disrepair in the 14th century.

Criccieth Castle

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Criccieth Castle sits on a rocky peninsula between two beaches.

Found on the south coast of the beautiful Llyn Peninsula, Criccieth Castle looks out over Cardigan Bay.

Built by Llywelyn the Great, this native castle was captured by Edward I in 1283 and became a prison before its walls were torn down by forces loyal to the rebel Owain Glyndwr in 1404, who also set it alight for good measure.