Cold War missile launch site which has been converted to a public park.

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.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A historic and oft-filmed prison stands in a Chicago suburb.

The final resting place of the world's first nuclear reactor.

This former nursery supplied plants for the creation of Chicago's largest park.

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

First planned industrial community in the United States.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

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

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

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Years of archaeology, just chillin' by the water cooler.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

These pretty kitties killed and ate as many as 135 railway workers.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

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

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

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

This historic hotel invented the chocolate brownie.

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

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