Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This abandoned amusement park was built on a site with a dark history.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A super-sized promotional trick that is now a D.C. landmark.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The romance of early commercial flight still fills this Art Deco destination.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This poor little statue is the most vandalized memorial in Washington.

The most accurate timepiece in the world.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A historic ruin just 20 feet away from a busy highway onramp.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."