These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This mouldering abandoned mental hospital was once a center for progressive healing.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

This decrepit abandoned building is made all the more eerie by its dark history.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

A long abandoned hospital building on the outskirts of NYC.

A formerly abandoned mental institute, now back in business.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The site of a gold-digging conquistador's bloody landing in the Americas.

"A hideous albatross in the Hudson River Valley."

Mass Grave of 48 colonists killed in a raid by Native Americans and the French in 1704.

Underground tunnels remain beneath this abandoned mental asylum.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.