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

Rising from the sea like a stone monster.

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

The world's most remote airport.

In the Middle Ages, villagers would sound this stone trumpet to boost fertility and coax fish to shore.

The ominously named cave is home to some remarkable ancient art.

This large round boulder is said to emit spiritual power, but it may just be magnets.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The largest stone moai on Rapa Nui.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

A Christian monastery stands on what was once a holy Incan temple.

Thousands of volcanic rocks carved 1,000 years ago.

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

An Inca spa, military outpost or maybe… both?

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Mystic Incan rock piles three miles above sea level.

It took 82 years and four different plaques to finally get the story right.

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 geometric feat is a testament to the Incas' mesmerizing architectural abilities.

An abandoned Incan construction project left behind a mysterious "doorway."

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.