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

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

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

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

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

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

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

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.