An overlooked tribute to one of the most important peace deals in American history.

The only tennis court that falls under the jurisdiction of the central bank.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

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

A secret greenspace hides atop a Capitol parking garage.

D.C. once had its own tiny rival to the New York Stock Exchange.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

The school tested mustard gas for the U.S. Army during World War I.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

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

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

When it comes to handsignals (and colonialism) rock always beats scissors.

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

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

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

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

Go take a picture with the inventor of the daguerreotype photographic process.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.