#AmazingArchitecture The DC Towers (also known as Donau City Towers) will be a pair of towers in Vienna's Donaucity. DC Tower 1 is complete and the first tenants moved into the offices in October 2013. DC Tower 1 is 220 meters high (250 meters including the antenna spire) which makes it the tallest skyscraper in Austria as it will be 18 meters higher than Millennium Tower, which was leading that ranking before. The DC Tower 1 was officially finished with an opening ceremony on Feb 26, 2014, by Buzz Aldrin.