The Cité de l'Automobile in Mulhouse exhibits the most abundant automobile collection in the world, with more than 450 cars on display over 6 acres (24,200 m²). The exhibition explores the history of the automobile from 1878 to the present day through emblematic models. Temporary exhibitions sometimes take place to bring together diverse cars on a specific theme. Fragile and priceless for some, they must be moved with great care. Some models weigh around 6,610 lbs (3 tons), like the Bugatti Royale Type 41.