A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

An ancient stone fortress considered by many to be the eighth wonder of the world.

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

This stone complex marks the urban center of a lost civilization.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

A church dedicated to the Mexican skeleton saint.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Part bookstore, part café, and part forest.

A pre-Columbian ceremonial and astronomical site built by the Taino Indians.

Mysterious "dots" seen from a satellite in southeast Peru.

Staves, storm-calling, and of course, necropants.

A market for witches is hidden within a train station.

Nimrod Polar Expedition base, and home to hundred-year-old frozen whisky.

Fire meets ice at the southernmost volcano on Earth.