The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

The grave of a champion Thoroughbred hides within the former presidential estate.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

A genuine Tudor manor transported piece by piece from England.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Where pardoned turkeys once spent their all-too-brief final days.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

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

The maritime museum that boasts the largest nautical library in the western hemisphere.

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.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

Within this lovely Richmond cemetery lie the remains of famous Virginians and some of Edgar Allan Poe's most beloved family and friends.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

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

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.