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The AquaDom in Berlin, Germany, is a 25 metre tall cylindrical acrylic glass aquarium with built-in transparent elevator. It is located at the Radisson Blu Hotel in Berlin-Mitte.

An exchange bookshelf in Berlin. You put a book on the shelf and take one out. This is so cool! I love how they're in tree trunks too.

I worked at a publishing house in Philadelphia that had a hidden "library shelf" door. It was great fun to astonish visitors by disappearing when they turned to inquire of the receptionist.

The Ruling Hall in Xaramar, the capital city of Xrath Empire Promenade by ZhouPeng - Zhou Peng - CGHUB via