Nearly 500 buildings in the state capital get their heat from a clean, renewable source located deep in the ground.

Greece has secret hot springs in Santorini that are a less crowded alternative to Iceland's Blue Lagoon, but if you want a domestic option, look no further than Idaho. The Gem State is home to an ...

Montana, Idaho, Colorado, and Utah have their fair share of therapeutic waters, but Wyoming has so many hot springs that they ... the waters are so blue they look like Gatorade.