Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

This failed condo development was reborn as a street art hub.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

A local landmark that has become a hub of graffiti and urban exploration.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

What once sat in the world’s spotlight is today a largely disused ghost complex.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

A remarkably intact castle that once was the largest in Ireland.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A village on the east coast of England that has almost completely eroded into the North Sea.

Once the most densely populated place in the world, this island is now a ghost town.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Railroad came. People came. Railroad left. Town died.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

An abandoned movie set in the desert of West Texas.