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

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

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

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

The only place for a truly presidential dram.

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

An innovative attempt to break a siege in the American Civil War still scars the earth today.

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

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

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

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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

The taxidermy remains of the most popular pony in children's literature.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

This historic mansion was built as a symbol of love between a husband and wife.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

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

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

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

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.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A former Confederate hospital serves as a remembrance of wounded and dead soldiers.