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.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

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

This massive swimming pool is the high tech home to the human-powered submarine races.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

There’s a special club house at the top for the bell ringers.

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

An Industrial Revolution-era public work that purified water using nothing but sand.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The oldest continuously operating fish market in the United States.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A historic neighborhood church is reborn as a psychedelic arts collective.