Watch HDToday. It's a part of Chicago that's full of surprises. It's home to a 28-square-mile forest with a rock canyon. It's where one of the Blues Brothers did time (along with thousands of other real-life convicts). And it's the setting for Chicago's most famous ghost story. It's home to major league soccer and minor league baseball. Chicago's largest Arab and Ghanaian communities are here. It's also home to a bustling industrial canal where salty mariners navigate a Panama Canal-sized lock past a hundred-year-old hydroelectric dam. This modern waterway follows the path of a 19th century canal that first connected the Great Lakes to the Mississippi. That earlier canal transformed Chicago from an isolated trading post on the edge of the American frontier into the fastest-growing city in the history of the world.