Chicago, IL: The The John Hancock Center on N. Michigan Ave. (along the "Magnificent Mile") was designed by structural engineer Fazlur Rahman Khan and Bruce Graham (both at Skidmore, Owings, and Merrill), and completed in 1969. Khan also worked on the Sears Tower (now called the Willis Tower), and the firm in general is responsible for many astounding structures around the world, including the amazing Burj Khalifa in Dubai (United Arab Emirates). Khan's considerable contributions to architecture and structural engineering are well described in the Wikipedia article mentioned above.