Of course there are much more direct ways to take advantage of the heat of earth and water in a site – such as recreational hot springs in places like Iceland. This resort makes explicit use of the heat of the water to cater to guests from around the world.
A massive airship hangar was transformed into a self-contained tropical city in the middle of the German countryside, complete with the world's largest pool.
Before the days of jetted tubs, spas, and heated pools, the only real place to soak in hot water not in your bath tub was to visit a geothermal hot spring.
Dreaming about a dip in a cool crystal-clear pool? These 13 natural swimming holes around the world, from Alabama to Laos, will tempt you to make travel plans.
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