The building is one of six Flakturm (flak tower) structures constructed by the German military in Vienna during WWII.
The exterior walls are roughly 2 to 3.5 meters thick, making the structure virtually indestructible.
The aquarium's shark tank holds approximately 300,000 liters of seawater.
The rooftop area serves as an active nesting site for peregrine falcons.
The 'Krokopark' is a free-roaming area for certain species where visitors walk alongside tropical vegetation and enclosures.
It is the only aquarium in Austria that keeps hammerhead sharks.
The building was converted into an aquarium in 1957, over a decade after the war ended.
Haus des Meeres is a public aquarium housed within a massive, former anti-aircraft flak tower built during World War II. It features a vertical layout spanning eleven floors, with specialized exhibits ranging from Mediterranean and tropical marine life to reptiles and birds. The facility houses a 360-degree shark tank that passes through the building's core. A dedicated terrarium floor showcases various species of crocodiles, snakes, and lizards. The rooftop terrace provides an elevated vantage point overlooking the Vienna skyline. The building remains a preserved historical structure, with thick concrete walls now repurposed for conservation and educational displays. It functions as a private, non-profit organization dedicated to marine and wildlife education.
The glass tunnel section of the main shark tank or the panoramic view from the rooftop observation deck.
Start your visit at the top floor and work your way down to manage the staircase transitions more easily.
Check the feeding schedule boards upon entry to see the sharks or piranhas being fed.
Use the exterior elevator to reach the roof terrace for the best city views before exploring the aquatic levels.
Do not attempt to walk from the ground level to the top if you have mobility issues; while elevators are present, they can become crowded, and the internal stairwell is extensive.
Open daily throughout the year, including public holidays.
