Glass Balcony
These amazing photos of the recently opened public glass balconies for public viewing. The 1.5″ thick glass floor (which resists up to 5 tons) offers amazing views over Chicago, from 1,353 feet in the air.
As you can see on a picture after the break, the balcony cantilevers from the main structure.
http://www.archdaily.com/27612/glass-balcony-at-sears-tower/
