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

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Unique collection containing a wide and curious range of contraceptive items.

Medical history museum featuring a lovely doctor's office from the 1800s.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The angel of death appears to weep black tears at this grave marker.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

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

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

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

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Home to items never before seen by the public.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.