A former defence tower used to stop bombers with flak cannons turned into an ocean aquarium. Apart from fish and sea creatures, you will also see snakes, tortoises, birds and even monkeys.
Climb to the top floor to get one the best views over Vienna from two viewing platforms or enjoy the view from a rooftop café.
Wikipedia https://en.wikipedia.org/wiki/Haus_des_Meeres
Official Website https://www.haus-des-meeres.at/
Email office@haus-des-meeres.at
Coordinates 48°11'51.587" N 16°21'10.554" E