Destroyed by flood waters, prison now serves as a training ground for armed forces.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

What was once the largest NFL stadium.

At the top of a local ski mountain is a hidden cemetery containing the graves of just two soldiers.

This tremendous trout welcomes visitors to a northern Michigan town with a rich fishing history.

This museum in the woods evokes the work and lives of Michigan's 19-century lumberjacks.

For more than 50 years, an iconic sign has greeted visiting “fudgies” to the Traverse City area.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

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

This freshwater spring fills with 10,000 gallons of water per minute.

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

An ethereal glowing blue ocean cave in Croatia.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Mountain where Jesus was first tempted by the Devil.

This cemetery features modernist statues as strange as its name.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The celebrated eyesore created by starry-eyed sweethearts.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.