Chicago's world-renowned architecture is literally the history of urban industrial growth in the last century. Our city has buildings in every style, starting with the Burnham and Root projects like the Rookery and Monadnock buildings and continuing through Mies van der Rohe (IBM Plaza, 330 N. Wabash) and his disciples at Skidmore Owings and Merrill (Willis Tower [originally Sears Tower], John Hancock Tower). However, there are architectural features of our city that are renowned and notorious, and their history can be a parable for our work as people who manufacture the web.