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The AquaDom  located at the Radisson Blu hotel in Berlin-Mitte, Germany, is an 82-foot-tall cylindrical acrylic glass aquarium with a built-in transparent elevator inside of it. The aquarium has more than 260,000 gallons of seawater and is home to more than 1500 fish from 50 different species. It takes three to four divers and almost 18 pounds of food a day to keep the fish fed.