(CNN) High fashion, breathtaking architecture and the world's best horses -- there is nothing quite like the Prix de Diane Longines.
One of the jewels of European racing, it tests the very finest fillies in the world but Sunday's event, dripping in glitz and glamor, is so much more than sport.
It's also an opportunity for spectators to bask in the sophistication of a Parisian race day, where the outfits and hats are as much in focus as the horses.
The timeless Chantilly Racecourse offers a fairytale setting for the festival of racing, with the overlooking Grand Chateau one of the most spectacular historical monuments in the world.
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The race course passes Chantilly's iconic Great Stables.
Visitors can picnic in the middle of the track and enjoy the infamous garden party.
Timeless Chantilly
The Grand Chateau has origins dating back to the 16th century, but was rebuilt after it was destroyed during the French Revolution. The neighboring Petit Chateau was also built in the 16th century.
Chantilly features three interlinked tracks surrounded by breathtaking woodland and the featured grandstand, which has sat proudly since 1879.
The spectacular venue has hosted the prestigious Prix du Jockey Club (the French Derby) since 1836 and the Prix de Diane (French Oaks) since 1843.
Chantilly also hosted the celebrated Prix de l'Arc de Triomphe in 2016 and 2017 while the race's traditional Longchamp home underwent a rejuvenation.
Chantilly's Great Stables, which border the track, are also said to be one of the most beautiful sites in racing.
Built in 1719, originally to serve the Chateau estate, the stables are now home to the famous Museum of the Horse.
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10 of the most picturesque racecourses
Boasting the world's first five-star trackside hotel, restaurants and a museum, Dubai's Meydan Racecourse is a first-class racing destination.
St. Moritz is known for world-class skiing, glitz, glamor and...horse racing? The venue for the White Turf event, held three days a year, isn't your typical racecourse. Instead, it's held on a frozen lake.
Flemington is Australia's oldest metropolitan racecourse and home to the famous Melbourne Cup. The revamped venue was first used in 1840 when the town of Melbourne was just five years old.
Simply put, there is no racecourse in the world quite like the Piazza del Campo in Italy. Its origins date back to medieval times when jockeys rode buffalo. The piazza is packed with spectators with racing around the outside.
Happy Valley Racecourse was built in 1845 to provide horse racing for expat Britons living in Hong Kong. It's surrounded by giant apartments and skyscrapers -- giving visitors an unusually beautiful scenic view.
Just the name "Ascot" conjures visions of royalty, elegance, high fashion and world-class racing. The racecourse was opened in 1711 by Queen Anne, and Royal Ascot is still one of the most celebrated meetings on the calendar.
Spectacular and timeless, historic Chantilly sits in front of the 16th-century Chateau de Chantilly and the majestic Great Stables (pictured) amid forests 30 miles north of Paris.
Laytown Races is the only official beach race in Europe. Situated on the Irish coast, the 150-year-old tradition attracts more than 5000 regular visitors every year. Horses race along the sands on a makeshift course.
The rolling Sussex countryside unfolds in front of one of the most iconic venues in flat racing. Goodwood has hosted racing since 1802 and offers the perfect setting for the famous Glorious Goodwood meeting.
Cheltenham is a shrine to jump racing against the idyllic backdrop of the Cotswold hills. It hosts the prestigious Cheltenham Festival every March, the highlight of the world's jump racing calendar.
Royal Ascot is a highlight of the British cultural calendar.
Royal Ascot is one of the highlights of the British summer's sporting and cultural calendar. Britain's Queen Elizabeth II and other leading members of the royal family are regular visitors.
It begins every day with the royal procession in horse-drawn carriages in front of the stands.
Meghan, Duchess of Sussex, and Prince Harry, Duke of Sussex, attended the opening day of Royal Ascot in Berkshire, west of London in 2018.
Prince Harry and Meghan present a trophy to jockey Frankie Dettori for his winning ride on Without Parole as trainer John Gosden (right) watches on.
The Queen is a big horse racing fan and continues the royal traditions of riding in a horse-drawn carriage up Ascot's Straight Mile to open each day, first introduced by King George IV in 1825.
Prince Charles and his wife, Camilla, Duchess of Cornwall, are regular attendees.
The Duchess of Cambridge, Prince William and Zara Philllips, daughter of Princess Anne, can also be spotted.
Royal Ascot is a quintessentially British sporting occasion.
Lunch in the car park is a Royal Ascot tradition for many.
Racegoers are obliged to dress up for the occasion, particularly in the Royal Enclosure where top hats and tails for men are compulsory.
Royal Ascot is very much a cathedral of high fashion ...
... and an occasion for dressing up.
Hats are big and bold -- no fascinators are allowed in the Royal Enclosure.
Even the dress code assistants have a special uniform.
Royal Ascot is a byword for pomp, pageantry, glamor and elegance.
The racing is world class with the cream of Europe's equine superstars and top trainers and jockeys.
Royal Ascot features five top-level Group 1 races over its five days with the highlight being the Ascot Gold Cup. Jockey Frankie Dettori won on Stradivarius for trainer John Gosden in 2018.
Britain's Queen Elizabeth II presents Frankie Dettori with his prize after he rode Stradivarius to win Ascot Gold Cup on day three of the royal meeting in 2018.
Garden Party
Due to its proximity to Paris, a race day at Chantilly attracts the cream of French society, with punters looking to escape the city.
Awaiting them is a festival of culture and al fresco entertainment, where visitors are encouraged to picnic in the middle of the track and enjoy the live music and chic craft stalls.
As well as watching the world-class racing on display, visitors are also invited to take part in a catwalk where the most elegant dresser wins a host of prizes.
Sunday's Prix de Diane is the highlight on a nine-race card and is otherwise known as the French Oaks -- in reference to the English fillies' Classic at Epsom the day before the Derby.
The contest is a 2,100-meter (1 mile 2½ furlongs) race for three-year-old fillies and the winner often takes part in the Prix de l'Arc de Triomphe later on in the year.
The course includes an exhausting uphill home straight where many races are won and lost.
Last year's champion Laurens scooped her connections $662,000 and this year is set for yet another tight contest with a $1.13m prize purse up for grabs.