Cook County, Illinois

The largest science museum in the western hemisphere, Chicago's Museum of Science and Industry contains more than 35,000 objects and nearly 14 acres of interactive exhibits.

Completed in 2006 by artist Anish Kapoor, Cloud Gate is a highly reflective work of public art in Chicago's Millennium Park. Inspired by liquid mercury, it is made of 168 stainless steel plates welded together with no visible seams.

Now officially named the Willis Tower, this 1973 Chicago skyscraper is the tallest building in the western hemisphere at 1,450 feet.

This unique Unitarian church made of concrete was designed by Frank Lloyd Wright in 1905 and completed in 1909. It is considered one of his great masterpieces.