The Sauna Box from Canadian design studio Castor is a traditional wood burning sauna built into a shipping container, and it runs entirely on solar power and a wood burning stove. The outside is constructed of Cor-Ten steel, which withstands saltwater, while the inside features a stone stool, sink, and custom wood and metal work. To top it all off, each box comes equipped with an iPod stereo, guitar hookup, stool, magnetic truck light, wool toque, and bronze antlers. Never been a sauna person myself, but this could convert me. More photos below:
See more at Castor.