Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

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.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

Two dozen pinball games hidden away inside a most unlikely location.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The final resting place of the world's first nuclear reactor.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

A building shaped like the Army Corps of Engineers logo, because why not?