Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

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.

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

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

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

Originally dubbed "Retirement" by the Navy Commodore who built it in 1780, this beautiful mansion is now the centerpiece of a suburban community park.

Hidden in the forest atop a long, winding driveway is this stately home.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Garments from across the globe call this hidden gem home.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

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

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Right next to departures—how convenient!

One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.