The Riesenrad has turned over Vienna since 1897 and stands just under 65 metres. It carries fifteen wooden gondolas; it was built with thirty, and when it was rebuilt after wartime damage only half went back, which is why the gaps between them are so wide. It runs slowly enough that a full turn is a conversation rather than a ride. Around it spreads the Wurstelprater, a fairground you walk into off the street and pay for by the ride.
There are roller coasters, ghost trains, a swing tower, shooting galleries, beer gardens and the smell of grilled sausage and fried dough, and it is unpolished and genuinely local. Behind it the Prater proper is a very large park, imperial hunting ground until 1766, with a chestnut avenue running straight through it for 4.4 kilometres. The wheel was put up for Franz Joseph's golden jubilee by an English engineer, Walter Bassett, who built the same kind of wheel in London, Blackpool and Paris. Vienna's is the only one of his left.