What are some unique (non-banquet hall) locations in Chicago for weddings?

The best wedding that I've ever attended was in Chicago. My brother-in-law got married on a boat that goes from the river downtown out to the lake (the priest was on the boat only for the ceremony, then we dropped him off so we could drink and dance all night), so you get to take in all of Chicago's architecture, very cly. It was also on a long weekend so we got to see the fireworks that are set off from a boat on the lake. Most of the wedding pictures have fireworks in the background. It was a great experience for everyone. You will not be disappointed.