An abandoned skate park located in the middle of the wilderness.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Home to the longest wooden escalators in the world.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

An eerie, derelict amusement park in Berlin.

Ride the subways of yesteryear.

The famed amusement district marks the beginning of summer with a wild procession of nautical creatures.

A subterranean house of worship carved right out of the bedrock.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

Explore the dark underground corridors of this graffiti-covered former military fortification.

This unique sculpture is often overlooked by pedestrians.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

During the holidays, a vintage subway train whisks New Yorkers back in time.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The angel of death appears to weep black tears at this grave marker.