A stone nook where Frederick Douglass escaped the world to think, read, and write.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

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

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

A historic cemetery filled with quirky faux wood art and unique tombstones.

This methodist cemetery is slowly receding into the wilderness along a Maryland highway.

One of the earliest and best-preserved buildings in Charles County, Maryland.

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