The Propeller Island City Lodge in Berlin, Germany, much like the Kunsthotel in the same city, is a gallery-like hotel. Its 31 rooms are named, not numbered, according to their design theme. At the lodge, you can choose to sleep in a coffin, a castle bed, or perhaps a strikingly orange room. Equally unique are rooms with slanted floors, wave-like walls, and caged beds. More like a mind trip than a vacation stay, the City Lodge is best suited for travelers who prefer a bit of adventure.