High Quality Content by WIKIPEDIA articles! The Vienna Donauturm (English: Danube Tower), opened in April 1964, is the tallest free-standing structure in Austria, at 252 metres (827 ft), the tallest structure in Austria, and among the 75 tallest towers in the world. The tower is located near the north bank of the Danube River in the district of Donaustadt. In the infobox there you can see the view towards northwest. The hills Leopoldsberg and Kahlenberg are visible in the background.