Meet manatees face-to-face at this zoo for native species.

A flooded Mexican cave that hides a river beneath the water.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The world's longest known cave system.

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

House built with over 60,000 glass bottles.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

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.

World's largest Christmas store.

A quarter-scale locomotive wonderland built by one man and his family.

The city is full of whimsical portals to another world.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Less a museum than a bizarre fantasy world created by artists and engineers.