Decades before the scandal, this staircase on the river was a literal "water gate."

Home to a vast and influential collection of Shakespeareana.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The house where John Wilkes Booth conspired with his co-conspirators.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The oldest continuously operating fish market in the United States.

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

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

The national park was once a plantation estate.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A nostalgic bibliographic gem.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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.

Home to vintage vehicles and local artifacts, this museum also houses a rare taxidermy specimen.

This Canadian city is actually two-in-one, even if they only respect the timezone of one side.

This decommissioned DC-3 now forever points into the oncoming wind.

When the big city meets the edge of the frontier, log skyscrapers are born.

Roadside collection of 65,000 signs.

A true treehouse near Hawai'i Volcanoes National Park.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.