Former hotel turned into haunted playground.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

The only place in America where anyone who wants can shovel coal aboard an antique train.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

This quirky museum has a collection of more than 15,000 bobblehead dolls.

A unique botanical garden housed in three giant geodesic domes.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

A unique outdoor timepiece at a "clothing-optional" resort.

A wondrously macabre treasury of obscure antiques and unusual oddities.

This lush 12-acre site was once named the finest Japanese garden in North America.

Walk along the intricate path of this stone labyrinth and gardens.

Moving, mind-blowing metal sculpture work of an outsider artist.

Wisconsin's most celebrated export gets the royal treatment on I-94.

A sprawling outdoor museum filled with larger-than-life works of art.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

A monument to the art of slicing people open.

The 30,000-volume library is one of the world's most impressive poetry collections.

A century-old network of freight tunnels underneath the city's historic business district.

Assemble a masterpiece at the first and only North American school exclusively dedicated to mosaic art.

A Museum of Holography frozen in 1974.

The first and only museum dedicated to stained glass and horology opened outside of Chicago in 2017.

Shop of curiosities with a dinosaur museum tucked in its basement.

This art gallery and oddities boutique bewitches visitors with a trove of occult trinkets and eccentric antiques, work by an ever-changing roster of underground artists, and classes in tarot and other mystic arts.