What is the most famous thing in Illionos?

One of the most famous attractions in Illinois is the Willis Tower, formerly known as the Sears Tower, located in Chicago. Standing at 1,450 feet, it was once the tallest building in the world and offers stunning views of the city from its Skydeck. Additionally, Illinois is renowned for its deep-dish Pizza and the historic Route 66, which starts in Chicago and symbolizes American road travel.