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

Not quite the menace it once was, this monster still has some chops.

A derelict bit of transportation infrastructure hidden in the woods.

One of only two commuter aerial tramways in the United States.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

A clone of a cloned tree that was so important it allegedly had its own guards.

This lovely pocket park is one of the most under appreciated in D.C.

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

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

The most accurate timepiece in the world.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The national park was once a plantation estate.

The oldest continuously operating fish market in the United States.

A super-sized promotional trick that is now a D.C. landmark.

A computer bug so primitive it was an actual insect.

It was once the base for a series of domestic terror attacks.

There’s a hidden military meme engraved on the World War II Memorial.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.