Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Medicinal spa created with the discharge from a geothermal energy plant.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

Europe’s most powerful hot spring supplies the surrounding region with hot water.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

A sulfuric martian landscape that looks far better than it smells.

Since ancient times these picturesque springs have been providing bathers with healing waters.

Geothermal waterfalls in Tuscany.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

A small thermal park among the mountains of Southern Italy features a surprising piece of modern art.

This natural spa is known for its healing properties and vibrant hue.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

The massive white mound and accompanying water terraces are a striking geological oddity.

Roman ruins top white travertine terraces formed by ancient hot springs.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

With a floor made of thick glass, this observation deck offers a full view of Sunwapta Valley's mountains and rivers.

Traditional 15th century Chinese garden in the middle of Vancouver.

Thousand-year-old trees tower within one of the world's only inland temperate rainforests.

The remains of the first saint from Alaska in the Russian Orthodox Church.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

A stunning blue-green lake located in the Terskey Alatau mountain range.