The abandoned coal loading dock is a canvas for unsanctioned art.

A local landmark with generations of spraypainted messages, and more being added each day.

An ever-evolving wall of graffiti art off East Liberty Street.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

A hidden alley in urban Baltimore is a haven for graffiti artists.

Trek through the jungle on a boat and a swinging bridge and you'll be rewarded with these refreshing, if pungent, mineral pools.

These legendary stone steps were once used to haul coffins up the rockface.

It was meant to help transport wounded soldiers to a secret underground hospital.

A coal fire has been burning underground here since 1896.

This recipe is set in stone.

This serene bamboo walkway allows Buddhist monks from remote temples access to the nearby village.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The world's tallest box hedge is found in a delightful garden.

Where thousands of slaves passed through the "Door of No Return."

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

These wooden balconies that are both decorative and functional.

The cluster of boulders near Fort Irwin is covered in military insignia.

European castle ruins in an American state park are actually the product of death and grief.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

A castle that was built stone by stone by an eccentric journalist.