The DuSable Bridge has two names and, in a sense, two histories. Built in 1920 and spanning the Chicago River at Michigan Avenue, it opened under Mayor "Big Bill" Thompson, Al Capone's friend, who died with $2 million in hidden safety deposit boxes. For most of its life it was called the Michigan Avenue Bridge, until 2010, when it was finally renamed for Jean Baptiste Point DuSable, the city's first non-Indigenous settler.

DuSable, likely Haitian-born, built a thriving trading post on this very riverbank in the 1770s, then sold it in 1800 for a sum that included 30 cattle, 38 pigs, two mules and 44 hens. He had been largely forgotten by Chicago for 150 years.

VoiceMap's tours of the Chicago Riverwalk and the city's 19th-century vice districts use the bridge as a starting point, tracing the corrupt mayors, gambling dens and shifting sands that shaped the city around it.