A building shaped like the Army Corps of Engineers logo, because why not?

Washington's iconic carousel has a nice piece of Civil Rights history.

A much-maligned monument to teetotalism.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The house where John Wilkes Booth conspired with his co-conspirators.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An overlooked memorial honoring the local Washington residents who died in World War I.

A derelict bit of transportation infrastructure hidden in the woods.

At 207 feet, one of the world's longest continuous escalators.

Decades before the scandal, this staircase on the river was a literal "water gate."

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The most accurate timepiece in the world.

The site of the climactic scene from the classic horror film is now a historic landmark.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A line of blue paint marks the route of the inaugural parade.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Tiny historical streetcars wind through a small scale version of Crescent City in this whimsical train garden.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.