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

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

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

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Take a drunken tour inside the world's largest known geode.

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

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

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

A display of magnificent stained glass windows is the first exhibit of its kind.

Called the “General Motors of the piano industry,” these buildings once produced as many as 700 pianos a week.

Curtiss is a forgotten figure in the early history of flight.

Legs Inn provides Polish food, a cornucopia of Odawa artwork, wood carvings, and mounted deer heads.

Strange physical sensations and optical contradictions keep visitors coming back for more.

A Northwoods sporting competition that shows lumber jacks doing much more than cutting down trees.

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

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

An enormous, inside-out glass globe built in 1935.

A monument celebrating the idea of reaching inaccessible places.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

An exotic wildlife habitat right off The Strip.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.