Watch Modern Marvels Season 12 Episode 28 Online

A steel giant standing 1,107 feet high on broad shoulders, this vertical city houses 1,200 people. Join us as we explore how a young architectural team from Skidmore, Owings & Merrill conceived of an innovative 100-story, multi-use tower. A construction crisis halted the project for six months, but once it resumed, it took just four years and 50 million man-hours to complete the John Hancock Center. In the heart of Chicago, the John Hancock Center rises 100 stories above the luxury shops and restaurants that line the famous Magnificent Mile. It opened on May 5, 1970 with 237,657 square feet of retailing, 812,160 square feet of offices, 703 rental apartments (converted to condominiums in 1974), 507-car parking garage, and an ice skating rink! There are 1,250 miles of wiring and 11,459 panes of glass. Nicknamed “Big John”, it cost $100-million and took 46,000 tons of steel to build.