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

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.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

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

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

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 park is home to the United States's only still-operating Dutch windmill.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

World's largest Christmas store.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

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

A walk through the historic city center, under the streets of Seattle.

This kitschy tavern is also home to rare early editions of "Treasure Island."

One of corporate America's best-kept secrets is also one of the most publicly displayed.

A fascinating aviation museum where you can chat with the veterans who once flew the aircraft on display.

Little did a museum know, they possessed the last-known lunch wagon in existence.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

The only surviving prototype for Buckminster Fuller's house of the future.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

One of the few working locomotive roundhouses in the United States.