The largest free-standing aquarium in the world resides in a hotel lobby in Berlin. At 25 meters high and 12 meters in diameter, the Aquadom is a sight to behold. It contains over one million liters of water, a coral reef, and is home to nearly 2,600 fish from 56 different species. A tank of this caliber can’t be taken in from the ground, and the hotel solved this problem in a grand way. A clear-walled elevator takes guests up through the inside of the tank for a full, 360 degree view of the fish, and the divers who care for them on a daily basis. 📸: Photo by Flickr user VXLA.