Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

This unique structure is the only one of its kind in Virginia.

The former home of the man whose radical ideas changed the nation.

At Brandy Station, Civil War soldiers left their mark on the battlefield and the walls of this small wooden house.

An eponymous directional signpost erected by the first president of the United States.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

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

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

These massive concrete balls were used to mine gold in Virginia.

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

This pun was simply waiting to come to life, and one defense contractor made it so.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.

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

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

A former major munitions plant that has been converted into a sprawling art space.

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

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

Extraordinary objects lurk in this quintessential regional museum.

A whopping 14,000 copper coins cover this miniature fighter jet.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.