The breathtaking world record attempt was achieved on Friday at the Skydive Chicago event in Ottawa, Illinois., USA. Hitting speeds of up to 180mph after they jumped from 18,000ft, they had 40 seconds of freefall to find each other and complete their formation. Once complete, it was largest... 

You can count Sears Tower, Chicago in the tallest buildings of America. The owners of this tower have installed some glass box balconies at 103  floor of the building, which are fix out of the building. If you want to view Chicago city at one sight you should visit the strangest glass box balcony at...