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.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

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

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

100 years later, they're still down there.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

Obscure Freemasons still live in D.C.’s largest private residence.

The towering figures were created from the cemetery's fallen old-growth trees.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A clone of a cloned tree that was so important it allegedly had its own guards.

This lovely pocket park is one of the most under appreciated in D.C.

This poor little statue is the most vandalized memorial in Washington.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

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