Elevated freight railway turned wildly successful urban park.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

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

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

A much-maligned monument to teetotalism.

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

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

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

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

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

Perhaps the most scandalous statue of America's first president.

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

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

Home to items never before seen by the public.

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

A geological mystery on Camelback Mountain.