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

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

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

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A building shaped like the Army Corps of Engineers logo, because why not?

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

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

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

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

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

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.

This forgotten boat elevator was an engineering marvel in its heyday.

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

Before Nixon, "watergate" meant canals.

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

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

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

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

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

A much-maligned monument to teetotalism.