Many saunas tend to consist of dim, wooden rooms, so you're often out of luck if you want to stare at local fauna and flora during your sweat bath. Sure, you'll find the occasional sauna with a window looking out on a mountain vista or frozen woodland, but what if you're less into bird watching and more into, say, aquariums?
Well, Nordic Marine Living AB and the Royal Institute of Technology in Stockholm have come up with the perfect compromise: the Nordic Submarine Sauna. Floating saunas are a common enough sight in certain corners of the world, but these Swedish masterminds have crossbred the concept with that of a glass-bottomed boat.
Once the heat's cranking, you can descend into the underwater glass observation area. Powerful, underwater searchlights even illuminate the surrounding waters at night.