More than 50,000 people were at Longchamp, in Paris, on Sunday to see three-year-old Danedream win the world’s richest horse race – the Qatar Prix de L’Arc de Triomphe.

She was the first German-trained horse to win the famous race since 1975 when Greville Starkey rode Star Appeal to victory.

But changes are on the cards for the historic French racecourse.

The Racing Post  says that Longchamp will close for a 20-month redevelopment project after the running of the 2012 Arc – meaning that the 2013 Arc will be run elsewhere.

One of the historic grandstands will be demolished and an all-weather circuit will be added along with 40 more boxes and a completely re-designed paddock.

Speculation is rife about which racecourse could hold a possible 50,000 or more spectators. Ascot has been mentioned by some as a possibility. Interest in the Arc seems to grow each year. The Guardian pointed out today that this year’s attendance was 17% up on 2010. But for much of the rest of the year Longchamp has a normal attendance of a few thousand.  The £50-£68-million redevelopment project aims to boost attendance all year round.