America's first federal monument.

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

Also known as the Founding Church of Scientology.

The first memorial dedicated solely to the Black troops who fought for the Union.

A historic neighborhood church is reborn as a psychedelic arts collective.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The United States Capitol's former columns still stand.

Yo, Adrian!

The U.S. Fish Commission’s effort to mass produce carp.

A huge musical instrument played by the ocean.

This unassuming passageway played a key role in one of the most important events in U.S. history.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

The very center of Paris is surrounded by a bevy of strange good luck rituals.