The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

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.

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

For nearly a year, General Ulysses S. Grant was based here during the American Civil War.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Rowdy rebels fortified this home during the first popular uprising in United States history.

The FBI's urban training course may have the highest fake crime rate in the world.

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

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

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

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The oddly shaped, steam-spewing building is now an art studio and gallery.

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

America's first public mental health facility.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

An alternate history park where the Union Army loses the war... to dinosaurs.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

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

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.