goCstudio have designed the Wa_Sauna, a privately owned sauna, designed and built to be used year round on Seattle’s Lake Union. The 240 square foot sauna is a registered vessel, powered by an electric trolling motor with three 12-volt batteries, and is heated by a wood burning stove. Inside, there’s enough room for 6 people. On top of the sauna, there’s a diving platform. There is also a small deck to sunbathe on.