A turquoise lake within a volcanic crater.

An unmarked, overgrown path through dense vegetation leads to the largest ancient structure in Polynesia.

A small subculture of boat dwellers keep their traditional way of living alive at this Hong Kong Typhoon Shelter.

A small Rwandan workshop where you'll find traditional works of art—made from cow dung.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

The Rio Lerma (Chignahuapan) in El Salto, Mexico, is one of the most polluted rivers in the world. It’s covered in white foam, and falling in can kill.

This sprawling, formerly elite sporting complex in Amman, Jordan has become a local picnic spot.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

Taoism, Buddhist and Confucianism are all represented in this temple that claims to answer anyone's wishes.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This beautiful eden was once the vacation home of Tahitian royals before Marlon Brando bought it.

Because sometimes the most efficient route from A to B isn't a straight line.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

This beautiful, historic church looks like something out of a simpler past.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

The closest thing to Mars on Earth.

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

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

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