This elegant arc of a waterfall marks a religious turning point.

Walk in the footsteps of the gods and straddle two tectonic plates.

An encyclopedic collection of mammal penises.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Rising from the sea like a stone monster.

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

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Massive volcano in the Andes is the farthest point from earth's center.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

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

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

A turquoise lake within a volcanic crater.

A swing to dangle you off the very edge.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

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

A remarkable geological formation resembling a forest made of stone.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

An unexpected desert oasis in South America.