This cave holds a surprisingly colorful variety of geological oddities.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

A place to eat for on-the-run agents and espionage enthusiasts.

The Bong-area park police have asked visitors to please, stop stealing the signs.

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

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

World's second largest particle accelerator, where nature reveals its secrets.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

A display of magnificent stained glass windows is the first exhibit of its kind.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This historic hotel invented the chocolate brownie.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Illegal drag racing two stories beneath Chicago’s streets.

A Museum of Holography frozen in 1974.

Pizza with a side of fine art.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.