Image Courtesy: Chicago Convention and Tourism Bureau
Formally known as the Sears Tower, Willis Tower stands 1,450 feet and
110 stories high, making it the tallest building in the western
hemisphere. The building is open daily for trips to the Skydeck on the
103rd floor, which gives breathtaking views of the city. The Ledge is
also an exciting option for risk-takers -- it's a glass balcony that
extends four feet outside the 103rd floor.