Chicago Architecture River Cruise. Cruise down the Chicago River to see the city's famous architecture on this 75-minute tour. With commentary from your onboard guide, watch the spectacular skyline glide by, including more than 40 notable buildings like the Aon Center, the Wrigley Building and the John Hancock Building. Cover all three branches of the Chicago River, passing the East Bank Club, the old Post Office Building and the Willis Tower (formerly known as the Sears Tower). Book and Save 9%! Chicago Architecture River Cruise.