Getaways with sauna

Allgäu, Bavaria

Ten wood igloo-shaped tiny houses sit on a swimming lake at Campingplatz Röhrenmoos near Wangen im Allgäu, with sauna and kitchen included.

Olympic Peninsula, Washington

A 20-foot-high treehouse over the water near Port Angeles, Washington, with two bedrooms, a hot tub and sauna, sleeping two.

Asheville, North Carolina

A-frame cabins, a treehouse, and a creekside sauna and cold plunge spread across 38 wooded acres near Asheville in Zirconia, North Carolina.