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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

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!”

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

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

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.

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

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

Before Nixon, "watergate" meant canals.

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

Art deco landmark on the outskirts of Washington, D.C.

There’s a special club house at the top for the bell ringers.

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

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

A much-maligned monument to teetotalism.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

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.