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

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

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

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

Washington's iconic carousel has a nice piece of Civil Rights history.

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

The national park was once a plantation estate.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The oldest continuously operating fish market in the United States.

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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.

People escaping slavery may have hidden inside a corpse vault.

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

A computer bug so primitive it was an actual insect.

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A haunting tribute to pioneering photographer Clover Adams.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Largest Roman Catholic church in North America.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A nostalgic bibliographic gem.