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

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

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

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

A hidden grotto on the grounds of the Kane County Government Center.

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

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

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

Tucked away amongst townhomes lies a restored, early 20th-century tea house and garden, the only remains of a historic estate.