The basement bowling alley of this St. Paul dive bar is decorated with thousands of dollar bills.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A one-stop shop for all things snowmobile, started by a snowmobile-obsessed group of friends in Wisconsin.

The center of the only hemisphere that awards visitors with a commemorative coin.

"Iron Age" creatures fill this huckster's rusted metal sculpture garden.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

An underground wonderland in Iowa.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

A wonderland of caves in eastern Iowa.

This large midwestern cavern features impressive rock formations and an underground waterfall.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

This once rural mansion now sits in the heart of the city.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.