The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Remnants of a storybook amusement park hidden behind a strip mall.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The whole world in one water tank.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

A nostalgic bibliographic gem.

Home to a vast and influential collection of Shakespeareana.

Home to items never before seen by the public.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

It was once the base for a series of domestic terror attacks.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.