Almost exactly two months after opening the Freedom Museum, the Tribune is opening another museum: the McCormick Tribune Bridgehouse & Chicago River Museum, which will be housed in a bridge-tender tower on the southwest corner of the Michigan Avenue bridge. According to the Associated Press, the building has only 1600 square feet of floor space, and will only be able to accommodate 34 visitors at a time. The museum officially opens on Saturday, and admission will be a suggested donation of $3.