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

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

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

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

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

This cemetery is all that remains of a school for "wayward" girls.