in october 12, 1962, the construction of the danube tower began, and two years later, the garden festival was held. the site of the garden show was known as donaupark. not far from donaupark, in 1967, the planning of the uno-city was started, opened in 1979. through the construction of the u1 and the reichsbruecke (empire bridge), the un-city had a high-ranking access to the traffic system.