An ancient city hidden in the heart of the Sierra Nevada mountains.

This whimsical home made entirely from clay is basically a giant piece of pottery.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Enchanting cave with a river crashing through the roof.

This picturesque mansion has gone from opulent ruin to nature museum.

An explosion of natural color known as "the river that ran away from paradise."

An abandoned Ecuadorian prison that once held ex-presidents and notorious con artists is now a carceral museum.

An exotic jungle hideaway run entirely by indigenous Kichwa women.

This Ecuadorian cemetery is home to a jaw-dropping topiary wonderland.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

A turquoise lake within a volcanic crater.

A remarkable geological formation resembling a forest made of stone.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Send a postcard while vacationing with Satan.

These spooky and unusual stone formations create an underworldly landscape.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Curious cave that stays a cool 56 degrees all year long.

A mysterious crater-like pond has a spooky tendency to empty and fill with complete disregard to rainfall patterns.

Half of a waterfall goes into the river while the other half seems to disappear.