This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

Two well-hidden huts let animal lovers spend the night among the bears, wolves, and other predators of the forest.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

The site of one of Japan's very few American occupations during World War II still holds the relics of a roundly disastrous campaign.

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

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

The now-abandoned Fascist summer colony served a dark purpose during World War II.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

A desert island with both a buried treasure and a famous castaway.

The island where one woman reigned as a "queen" over 30-odd Japanese soldiers who refused to believe that WWII had ended.

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

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

The highest point in Virginia can only be reached by passing through ponies and flowers.

This tiny home built on revenge appears to be scarcely wider than a Volkswagen.

This picturesque abandoned home is rumored to be a spite house.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

Now abandoned, the world's first torpedo factory is crumbling into the sea.