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

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

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 celebrity from the late Cretaceous period.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Mural fragments and various sculptures honor the longtime artist.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

One man’s hobby is another man’s world of metal wonders.

A museum dedicated exclusively to the lore and history of ouija boards.

The final resting place of one member of the Amistad slave revolt who never made it back home.

No one really knows how these old hobby horses got here, but the herd keeps growing.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

This exhibit is devoted to the games and wonder that Hasbro has brought children worldwide.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

This massive solar system model is sprawled out across Maine's suburban wilderness.

A serene plaza that commemorates one of the Granite State's most iconic figures.

This candy-striped tower is the farthest east you can go in the United States.