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The Museum of Science and Industry is a fascinating place to visit if you want to learn more about the Earth, the human body, technology, and science. With over 2,000 exhibits spread across 75 halls that cover about 14 acres, the museum opened in 1933 and is now the biggest science museum in the Western Hemisphere. In 2009, the museum had a record attendance of over 1.6 million guests, making it the third-largest cultural attraction in Chicago. The museum has a range of permanent exhibits, including a working coal mine, a 3,500-square-foot model railroad, a German Submarine captured in World War II, and a NASA spacecraft used for the Apollo 8 mission in 1968. Additionally, visitors can experience flight simulators, military crafts, an assembly line replica, a 40-foot water vapor tornado, a 13-foot interactive heart, and much more.

The Willis Tower, previously known as the Sears Tower, is in downtown Chicago. Completed in 1974, it is a 108-story building that held the title of the tallest building in the world for nearly 25 years. It remains the tallest building in the United States. The Skydeck, located on the 103rd floor, is the building's observation deck, approximately 1,353 feet above the ground. It is one of Chicago's most popular tourist attractions, welcoming about 1.3 million visitors annually. Recently, renovations have introduced new glass balconies with floors extending four feet over the street. The balcony provides stunning views of Illinois, Lake Michigan, and neighboring states Indiana, Michigan, and Wisconsin on a clear day.