Recorded as the first person buried in Arlington Cemetery.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

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

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

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

Now a living classroom, this house was once the home of Reverend James Clinton Dent, a formerly enslaved man and a pastor.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

This lovely pocket park is one of the most under appreciated in D.C.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

This site is believed to be connected to the oldest house in Arlington County.

100 years later, they're still down there.

The U.S. Fish Commission’s effort to mass produce carp.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.