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

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

Detroit housing collective working to create an "environment for revolutionary change."

Enormous small-business mecca in the Midwest, serving dozens of artists.

Haunting and beautiful trees, doomed to die.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Most prolific publishing house in the 1600s open to the public.

Every equinox this Maya pyramid puts on a spooky ancient light show.

More than five miles of underground passageways.

Astounding collection of coin-operated games and automata.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.