The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

"The country that ate itself."

Quite possibly the most isolated bus stop on Earth.

On a desolate hill overlooking McMurdo Station, a statue of the Virgin Mary stands inside a curved iron frame.

This "witch's market" is filled with Amazonian herbs, remedies, and the occasional libido-strengthening tincture.

A vertical tube that allows you to see what's going on underneath the Antarctic sea ice.

This pier made of ice and constructed over the Antarctic winter is used when the resupply cargo ships arrive in summer.

This 19th-century zoological collection has withstood the test of time.

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

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

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 enigmatic and seldom visited ruins of a Mayan city-state.

Trek through the jungle on a boat and a swinging bridge and you'll be rewarded with these refreshing, if pungent, mineral pools.

After becoming locally extinct, this esteemed avian now flies free in the forests around the ancient ruins.

Few of the many visitors to this resort town know of its hidden Maya ruins.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

A field of whimsical floats, where all of your favorite childhood stories have been put out to pasture.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

The Tübingen University anatomical collection hosts an example of an extremely rare medical phenomenon.

Cave where bat-eating snakes hang down from the ceiling.

A lake at the bottom of the ocean.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.