In my opinion, the best idea to turn a big, old and useless concrete block (a flak tower from the Second World War) into something great. In the middle of Vienna, next to the Mariahilfer Straße is the “Haus des Meeres”. Here you can admire numerous small to very large aquariums with colorful fish and terrarium animals. Highlights are, for example, the sea turtle or the Koi carp at the beginning, which can even be caressed. Super is the tropical area, where small monkeys and many birds fly freely and one can observe the animals at close range.
From the viewing terrace of the former flak tower you have a wonderful view over the rooftops of Vienna. Of course, there is also a bistro, changing tables, as well as the possibility to put off baby carriages etc.
Perfect for romping is the exterior of the house of the sea, right on the exterior wall of the building is a climbing wall. So if you have the urge to have to move after or before the visit a little, you can try to climb the 47 m high tower. Children who are satisfied with a little less effort can play in the playground next to the house of the sea.