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

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

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

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

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

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

D.C. once had its own tiny rival to the New York Stock Exchange.

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

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

This poor little statue is the most vandalized memorial in Washington.

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

When it opened during the final years of the embargo, all the drinks and cigars were free.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The span is crooked and made from two older recycled bridges.

This forgotten boat elevator was an engineering marvel in its heyday.

A building shaped like the Army Corps of Engineers logo, because why not?

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

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

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.