A monument marks the location of the first successful steamboat demonstration.

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

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

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

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

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

Before Nixon, "watergate" meant canals.

When it comes to handsignals (and colonialism) rock always beats scissors.

Thousands of tiny squares in different colors make up this piece of street art.

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

An unusual sculpture, an interesting history, in a strange place, for a good cause.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

A historic ruin just 20 feet away from a busy highway onramp.

An overlooked tribute to one of the most important peace deals in American history.

At 207 feet, one of the world's longest continuous escalators.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

A secret greenspace hides atop a Capitol parking garage.

The first memorial dedicated solely to the Black troops who fought for the Union.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.