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

A historic arena where the Beatles played their first concert in the U.S.

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

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

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

The most accurate timepiece in the world.

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.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

An Industrial Revolution-era public work that purified water using nothing but sand.

The most decorated dog of World War I is preserved in the Smithsonian.

Before Nixon, "watergate" meant canals.

Art deco landmark on the outskirts of Washington, D.C.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

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

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

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

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

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

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