Over time, this castle grew to encompass the entire island.

A natural sandstone bridge hidden in the Sewanee forest.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

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

In this mine all the gold you can carry may not be as sweet of a deal as it sounds.

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

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

A colorful Peruvian city of the dead.

Extraordinary rock formations in open Peruvian fields.

Mysterious Incan ruins on a tiny island in Lake Titicaca.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

Come for the speed, leave in love with the desert.

Bacteria and algae give the salty water its bubblegum hue.

No one is sure why this mysterious tradition started.

A tiny graveyard with a mysterious past.

This neo-Gothic monastery offers a rare chance to witness the unique maned wolf right up close.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

This breathtaking national park is one of the best places to see the weird and wonderful giant anteater in the wild.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

A market for witches is hidden within a train station.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

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