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

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

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

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

Get up close and personal at this Fresnel Lens.

This former Cold War missile control site played an important role in the creation of GPS.

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

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

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

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

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

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

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

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

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

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

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

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.