Willis Tower, previously known as Sear Tower, in Chicago, Illinois was the tallest building in the world after it’s construction in 1973. It held that title for 25 years.
It is a popular tourist destination in Chicago. Accordingly, more than one million tourists visit its observation deck. To the delight of flocks of tourists, its 103rd floor has a glass balcony named The Ledge that extends 4 meters outside where one can actually step and walk onto. This is definitely not for those with acrophobia (fear of heights) like me.