The world's longest known cave system.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The largest earthwork effigy in the world.

Where beautiful signs live on forever.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

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

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Wisconsin's most celebrated export gets the royal treatment on I-94.

An ever-evolving wall of graffiti art off East Liberty Street.

Statue dedicated to the star of an old television show.

The city is full of whimsical portals to another world.

Astounding collection of coin-operated games and automata.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

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

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

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

Ancient petroglyphs discovered only after a massive fire swept across Michigan in the 1880s.

World's largest Christmas store.

One man’s vision of living among dinosaurs credits Jesus Christ as the engine of biological evolution.

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

Former self-sufficient mental institution now a planned community.

House built with over 60,000 glass bottles.