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.

This Brazilian astronomy museum allows guests to gaze at the stars through their telescopes each weekend.

Off-limits and full of venomous pit vipers, Brazil’s Snake Island has a frighteningly apt nickname.

Bolivia's needle-like rock formations.

Astronomical observatory above Lake Titicaca.

A valley of unique erosion patterns lends to a view like nothing on Earth.

A seemingly endless landscape of pure salt stretches far across Bolivia.

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

This observatory high on a hilltop in the center of Santiago got its start in 1852.

The world's most remote airport.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

Named for the DeFoe novel inspired by a stranded sailor, this island is known for its rare plants and extreme beauty.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

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

The largest stone moai on Rapa Nui.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A dangling church built over a Colombian gorge.

A swing to dangle you off the very edge.

A kitschy Italian medieval-style castle incongruously located amidst one of the most historic towns in the Peruvian Amazon.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

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

The southernmost Anglican cathedral in the world has whale bones standing in its yard.