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

The legacy of a wealthy executive and his wife, this little-known art museum features works by Picasso, Monet, Renoir, Cezanne, and more.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

This taxidermy horse was a Civil War hero.

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

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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A celebrity from the late Cretaceous period.

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

A derelict bit of transportation infrastructure hidden in the woods.

The site of the climactic scene from the classic horror film is now a historic landmark.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A small Richmond island dotted with the remnants of hundreds of years of history.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Memorial stone for GWAR vocalist, depicted in his iconic costume.

This estate on the banks of the James River was home to a Founding Father, two presidents, a famous bugle melody, and what some say was the actual first Thanksgiving.

John Tyler never got to be buried at his beloved home, but every pet his family owned since has been.

The land is home to swimming ponies and a legendary 18th-century treasure.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

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