An 820-ft tall skyscraper with 60 floors, the slender DC Tower 1, with its “folded” black glass facade, rises elegantly into the sky above the Donau City complex. Designed by French architect Dominique Perrault, it’s Austria's tallest building and was designed to comply with all EU sustainability criteria. There is a restaurant with 360-degree views of the city on the 57th floor. On the weekends, they open the roof top bar and a DJ spins music while guests enjoy the highest view in Austria.