The colorful stairs are made with marble from the world's major quarries.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A sweet symbol marks the place where torturous executions were once carried out.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

Recorded as the first person buried in Arlington Cemetery.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

Right next to departures—how convenient!

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

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

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.

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

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

The statues commemorate the legendary mass killing of escaped circus monkeys.

A vast collection of rare, historical, and vintage supercomputers.

A man's home is his castle.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

A luxuriant botanical garden below sea level.

The oldest standing structure in downtown San Diego.

Remnants of a wall built to separate Black residents of Hall's Hill from a newly built subdivision are a grim reminder of segregation in 20th-century Virginia.

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.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."