Elevators are the blood-vessels of modern office buildings. They are becoming ever more important as buildings are getting higher and higher. The number of buildings over 200 meters has tripled since 2000. But elevators do not have to be some tin containers suspended on ropes and hidden somewhere in a building. The lobby of the Radisson Blue Hotel in Berlin has a 25-metre-high AquaDom, the world’s largest freestanding cylindrical aquarium. Inside you can find a 2-storied glass elevator, more than 1,500 tropical fish and 1 million liters of salt water.