The Riesenrad has turned since 1897, when it was put up for Franz Joseph's golden jubilee by an English engineer named Walter Bassett, who built the same kind of wheel in London, Blackpool and Paris. Vienna's is the only one of his left. It stands just under 65 metres and 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: roller coasters, ghost trains, a swing tower, shooting galleries, beer gardens and the smell of grilled sausage and fried dough. It is unpolished and genuinely local. Behind it the Prater proper is a very large park — imperial hunting ground until Joseph II opened it to the public in 1766 — with a chestnut avenue running straight through it for 4.4 kilometres.