The largest science museum in the Western Hemisphere! Housed in the only remaining building from the 1893 World’s Fair, MSI is a Chicago must-see. You’ll experience 14 acres of hands-on exhibits and have the chance to stand before a 40-foot tornado; climb aboard a World War II German submarine; take a run in a human-sized hamster wheel; descend into an Illinois coal mine; tour a fully functioning eco-friendly home; board a 727 hanging from the ceiling; transmit your pulse to a 13-foot, 3-D beating heart; and much more! MSI is not a place where you walk around quietly and observe. No way! You get involved in the fun—and learn—by doing.