Whether it is braving the ledge or learning about the windy city visitors get a one stop chicago experience on their journey to 103 theskydeckoffers a breathtaking view of the city of chicago this is a great opportunity to climb the willis tower formerly sears tower the worlds tallest building from 1974 until 1998 and see the beautiful architecture of the city and its endless views of lake michigan the more adventurous can go to thethe ledge the newest acquisition of the skydec