A hot spring in the open air under a night sky, a vision that former spa owner Lee Campbell has for a piece of land in Hot ...

For more information about Mammoth Hot Springs, check out the National Park Service's website. Yellowstone”Open Air” Glass Top Convertible Van West Yellowstone (11 reviews) ...

TANABE, Wakayama Prefecture--A seasonal open-air hot spring bath alongside a river opened recently, giving visitors the opportunity to relax in what looks like a swimming pool at the Kawayu Onsen ...

Mineral springs day passes start at $50 with purchase of a spa treatment. Information: 707-942-4913 or 707-709-8139. This resort offers open-air mineral pools and in-room mineral hot tubs.