Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The retired vessel is South America's first floating museum.

Mysterious "dots" seen from a satellite in southeast Peru.

These overlooked ruins give an intimate look at the Inca Empire's urban planning prowess.

An Inca spa, military outpost or maybe… both?

This high-Andean reserve protects the graceful vicuña that was nearly hunted to extinction for its precious wool.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

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

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

After an epic flood washed away its enslavers, this city has been part ghost town, part cultural wildcard for the past three centuries.

Hundreds of mummies in a silent room, some with eerily pained expressions preserved on their faces.

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

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

This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

This stone complex marks the urban center of a lost civilization.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

One of the most remote lodges in the Amazon offers rare wildlife encounters and undisturbed views of the Peruvian rainforest.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

The world's largest clay lick, where parrots gather to snack.

Extraordinary rock formations in open Peruvian fields.

An unexpected desert oasis in South America.