This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The wing of this deserted Boeing 737 almost touches the Dunkin' Donuts next door.

Someone left a Boeing 737 in a field in southern Bali.

During the rainy season, this temple is almost entirely submerged, accessible only by boat.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

Stunning wetlands ablaze with pink lotus flowers.

Derelict airplane bodies serve as both home and income for three Thai families.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

A modern version of the stone cairns built by the Inuit.

These little-known sands dunes are a geological anomaly in Saskatchewan's southern prairies.

These hellish-looking cliffs in the Canadian Arctic have been burning for centuries.

The closest thing to Mars on Earth.

A series of eerie metal stick figures are spread out over four square miles on the bed of a huge salt lake in the Australian Outback.

These Australian rock formations look like Martian beehives that have grown up out of the landscape.

This abandoned Greek island was the last active leper colony in Europe.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.