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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

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

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

The "lovely red Vega" of the legendary record-settling pilot.

Where the U.S. government kept its actual treasure, before Fort Knox.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A computer bug so primitive it was an actual insect.

A haunting tribute to pioneering photographer Clover Adams.

The house where John Wilkes Booth conspired with his co-conspirators.

A super-sized promotional trick that is now a D.C. landmark.

Home to a vast and influential collection of Shakespeareana.