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

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

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

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

A much-maligned monument to teetotalism.

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

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

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

Home to a vast and influential collection of Shakespeareana.

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

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

The towering figures were created from the cemetery's fallen old-growth trees.

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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

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

A clone of a cloned tree that was so important it allegedly had its own guards.

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

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

Go take a picture with the inventor of the daguerreotype photographic process.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

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