A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The only Leonardo Da Vinci painting in the Western Hemisphere.

This grand gothic brewery has been pumping out suds for over a hundred years.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

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

This taxidermy horse was a Civil War hero.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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

The national park was once a plantation estate.

Home to items never before seen by the public.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Below this enormous headstone lie Billy and Benny McCrary, better known as the "McGuire Twins."

The wooden house where the jazz great learned to play the piano.

The author's beautiful and historic home is also a fully functioning goat farm.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

A shrine to the royal lord of all cacti.

The only airport with a people mover system designed by Walt Disney Imagineering.