I dig these. (but I also dug coffin hotels in tokyo)

 

Dasparkhotel (The Park Hotel) is, literally, a series of tubes. Constructed from repurposed sewer pipes, each tiny room offers a double bed, storage space, a light, and the fun of an inside that is very nearly outside. Nearby are shared toilets, showers, a bar and coffee shop. [via Laughing Squid]