Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

Also known as the Founding Church of Scientology.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

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

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

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

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

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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

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

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

A historic arena where the Beatles played their first concert in the U.S.

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

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

A much-maligned monument to teetotalism.

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