The Donauturm is a 827-foot (252 meter) tower overlooking Donaupark, Uno City, and Vienna. It was built in 1964. For a small fee (about Ös100), an elevator will take you to the top where is a cafe, and a restaurant. Both revolve. Those are frequently full, especially in the evening, but you can still catch the view from a lower observation level. Sadly, the windows are pretty narrow, and the view of Vienna isn't that great after dusk. If you go, be sure it's a clear afternoon, and you stand a good chance of seeing from the Alps to Hungary. If you'd like to take in the lights of the city, the observation deck is open until midnight. On the way up and, more disturbingly, on the way down you can look up through a glass plate in the ceiling of the elevator car and watch the world fall away from you in just 35 seconds. Very disorienting. At the top of the tower is a giant red tilde (~) shape that rotates around the television antenna. For those not from the area, it's the symbol of BankAustria.