The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

This historic general store still operates much as it did in the late 1800s.

The last intact steam engine factory in the United States.

Located inside a former bread factory, this museum explores a century of transportation history through innovations that were extraordinary or failures—sometimes both.

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

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Opulent downtown movie theater now houses cars as an indoor parking garage.

This sprawling bookstore spans four floors and has more than a million books in stock.

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

A sprawling maze of used books piled from floor to ceiling.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

North Central Florida's largest flea market and a weekend roadtripper's dream.

A humid oasis combines recreation with exploration in a unique underwater cavern.

One of only two pod-shaped homes designed by Frank Lloyd Wright.

This fairytale-inspired cottage was created by a university literature professor.

The so-called "world's shortest river" is actually a window into a cave.

This abandoned bridge is now a favorite haunt for graffiti artists.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.