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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The rogue roots are gradually consuming some of the historic marble grave markers.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

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

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

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Military and first responders can test their skills in a Foggy Bottom mock station down in Georgia.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

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

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

The oldest orange tree in California spawned a generation of citrus farmers.

The Bong-area park police have asked visitors to please, stop stealing the signs.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

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

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

The national park was once a plantation estate.

The U.S. government built the million-pound stack of steel during the Space Race.

There’s a hidden military meme engraved on the World War II Memorial.