Museum of Science and Industry (Chicago)
MSI is the largest science museum in the Western Hemisphere. It has a full-size replica coal mine, a German submarine (U-505) captured during World War II, a 3,500-square-foot (330 m2) model railroad, the first diesel-powered streamlined stainless-steel passenger train (Pioneer Zephyr), and the Apollo 8 spacecraft that carried the first humans to the Moon.