The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

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

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

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

A private Las Vegas horse ranch adorned with whimsical artwork.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

A geological mystery on Camelback Mountain.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

The angel of death appears to weep black tears at this grave marker.

A terrific purveyor of natural history objects and curios.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

Hidden beneath the waters of Lake Michigan rests a perfectly intact ship from the early 1900s.

The 10-foot-tall vegetables belong to Michigan’s first food rescue program.

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

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

The world’s largest Masonic temple was saved by the White Stripes.

This feline raises a friendly paw at drivers barreling toward the freeway.

This shallow cave got its name from copious amount of human bones found inside.

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

Largest outdoor staircase in the United States.

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

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.