Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

A line of blue paint marks the route of the inaugural parade.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

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

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

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

There’s a hidden military meme engraved on the World War II Memorial.

The oldest continuously operating fish market in the United States.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Before Nixon, "watergate" meant canals.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

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

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