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

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

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

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

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

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

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

Turnip-shaped island just off the Michigan shore in Lake Huron.

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

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

Even in death, he's still your huckleberry.

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

The highest bridge in America was built for an almost unnervingly small amount of money.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.