This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

These abandoned waterworks are crumbling into the Potomac River.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

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

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The rogue roots are gradually consuming some of the historic marble grave markers.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

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

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.