Donauturm

The Donauturm (English: Danube Tower) is a tower located in the Donaupark, Vienna, Austria. Opened in April 1964, it is the tallest structure in Austria, standing at 252 meters (827 feet), and ranks as the 61st tallest tower in the world.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).