These curious caverns have been home to mushrooms, gangsters, and disco.

20,000 pieces in a Frank Gehry-designed building.

A retro walk through the history of the tube.

Inside, ancient treasures. Outside, modern contradictions.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

A county library in rural Ohio houses one of the finest mineral collections in the world.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

A real flying saucer, contracted by the U.S. Air Force.

An art deco ice cream shop covered in vintage train station tiles.

What is it about mushrooms that makes people wish they lived inside of them?

Where beautiful signs live on forever.

Take a drunken tour inside the world's largest known geode.

A palatial art deco restroom.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

One of two giant blue cockerel statues erected with an intentional double meaning.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

A Borgesian work of art that may blur the line between fiction and reality a little too convincingly.

When waves crash onto this section of beach, the rocks sing a song.

An abandoned bus station transformed into a museum dedicated to the history of Greyhound Lines, in the place where it all began.

Home to part of the world’s largest private collection of original manuscripts and documents.