Bohol's mysterious brown hills.

Five miles of underground river link lake to ocean.

Smoked mummies housed in mountainside caves.

A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

A man-made island designed to look like a massive battleship.

A massive underwater sinkhole made famous by Jacques Cousteau.

Sloth rehabilitation center in the jungle of Costa Rica.

The youngest volcano in Central America.

A natural gas leak provides a flickering flame beneath a waterfall.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

An antique cemetery in New York, this land is home to any number of famed corpses.

The Fox Sisters, America's leading mediums in the mid-19th century, possessed a table they claimed helped them "communicate" with the dead.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

Genesis of modern hydroelectric power.

A Museum of Holography frozen in 1974.

Quite possibly the last cross all humans will ever see.

Museum dedicated to the struggles of the disabled.

Toxic waste disaster that founded the Superfund program.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest source of fossilized insects anywhere.

An annual festival celebrating Colorado's most famous frozen corpse.

A monument to the art of slicing people open.