A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

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

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Underground tunnels remain beneath this abandoned mental asylum.

Ruins of a historic medical facility sits eerily by the water.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Yo, Adrian!

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

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

A toxic ghost town sitting atop a massive coal fire.

A huge musical instrument played by the ocean.

This once luxurious Catskills resort is now a haunting ruin.

An abandoned castle owned and ignored by Masons carries a cursed history.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.