The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

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

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The only tennis court that falls under the jurisdiction of the central bank.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

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

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

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

Over the last century, this elegant columned facade has been home to the headquarters of a bank, several nightclubs, and a restaurant.

A computer bug so primitive it was an actual insect.

This unassuming passageway played a key role in one of the most important events in U.S. history.

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

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

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