Last night I happened to be on Michigan Avenue at the Chicago River when the weekly fireworks display went off. Apparently, every Saturday night at 6:30 they launch a pyrotechnic display over the river right at the Michigan Avenue bridge. I heard it before I saw it, and was it ever loud. I stood watching on the south west corner at Michagan and Wacker and the sound of the explosions echoing off the tall buildings all around was an amazing effect.
This was the view earlier that evening, from Wacker Drive, looking across the Chicago River toward the Wrigley Building.