The aquarium is located in a rather bunker-esque building, not giving much clue to the diversity of animals housed within. The fishtanks were decently sized, with a great number of different animals such as hammerhead sharks, snakes, seaturtles, spiders, lizards, bats, monkeys, seahorses, and much more.
Don't get me wrong, the tanks are not huge in any way, so if you expect massive spectacles this is not the place for you, but if you would like to see a range of different animals, for a reasonable price then Haus de meres is a good choice, my gf loved it.
Be sure to go to the top of the building, you can go outside, and it offers a great view of vienna.
Steer clear of the cantina though, ok food and sourly staff.
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