AquaDom

The AquaDom in Berlin, Germany, is a 25 m (82 ft) tall cylindrical acrylic glass aquarium with built-in transparent elevator. It is located at the Radisson Blu Hotel in Berlin-Mitte. The DomAquarée complex also contains a hotel, offices, a restaurant, and the aquarium Sea Life Centre.
The AquaDom was opened in 2004. It cost about 12.8 million euros. The acrylic cylinder was produced by the U.S. company International Concept Management, Inc. It is now the main attraction of the Berlin Sea Life Centre.
The outside cylinder was manufactured on-site from twelve sets of panels sent from the factory; the inside cylinder for the elevator was installed as one piece after three sections of 5 panels each were bonded together next to the hotel. The Aquadom is the largest (by volume) acrylic cylindrical aquarium in the world, with a diameter of about 11 m (36 ft), and it is built on a 9 m (30 ft) tall foundation. Filled with 1,000,000 l (260,000 US gal) of water, it contains over 1,500 fish of 50 species. The feeding of the fish and the cleaning of the fish tank is performed daily by 3-4 divers. The fish need 8 kg (18 lb) of fish food.