Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

Crawling into this primordial cave may feel disconcertingly familiar.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

This small oxbow lake has rare giant river otters and some Seussian-sounding birds.

Ancient Peruvian fertility temple or modern money-making hoax? Either way these monoliths still look like penises.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

Art school in the Amazon: Drugs, nature and sustainable agriculture.

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

An unexpected desert oasis in South America.

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

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

A scalable map of Colombia with the bonus of a butterfly house.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

Cathedral carved out of salt, located a mile below the earth's surface.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

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

Enchanting cave with a river crashing through the roof.

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

Visit this small Mexican church to pray to a mushroom that is supposedly marked with the image of Christ.

A tomb in the shape of a traditional Mexican hat and shawl for the father of modern rancheras.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

At least seven hues of blue and turquoise make this freshwater lagoon unique.