Formerly the Sears Tower, and still commonly referred to as such, ‘The Ledge’ at Willis Tower was installed five years ago in 2009.
The three small glass boxes – which are 10ft high and 10ft wide – stick out on the 103rd floor of the building, meaning they look 412 metres back down to the ground.
The boxes can bear 4.5 tons of weight, although the laminated glass covering the floor of one of the boxes did shatter in May 2014 while a couple of tourists were sitting on it.
The visitors weren’t harmed in the incident, but we’re willing to bet they got out of there pretty quickly…
