On our way up to Switzerland we broke our journey in Mulhouse, staying two nights so we could visit the (rightly) celebrated Cité de l'Automobile. Based on the extensive collection of the brothers Schlumph, but now the national car collection of France, it claims to be the world's largest car collection.
Having been to a few car collections in my time I can see no reason to doubt it - it's enormous! Being based in the old woollen weaving mill of the Schlumph brothers they have plenty of space, with 2 hectares (about 5 acres) of factory onder one roof.
The collection contains 123 Bugattis, the largest collection of the marque in the world, and the obsession that finally ruined the business. (You can read about "the Schlumph affair" here)
The grey and black Citroen Traction Avant is a 7A of 1934.
We had a great time at the museum, which is a properly curated collection, with a couple of display spaces for special exhibitions. It also has a very fine cafeteria selling good meals at extremely reasonable prices. What's not to like?