Looking to heat things up this winter? The Sauna Box offers the luxury of a full-service sauna under the guise of a red steel shipping container. Designed by Castor for Matter in NYC, the literal box has an interior lined with cedar, and is powered through solar energy and a wood-fired stove. As is expected from any visit to the spa, furnishings including an iPod stereo, a Castor stool, magnetic truck light, and bronze antlers that set the mood for relaxation – or romance – are included. Consider this self-contained sauna as a portable getaway during the colder months of the year!