9 World’s Largest Buildings, Planes and More By Media Team - August 13, 2013 414shares Share Tweet Flip Ever wonder what is the world’s highest building? Largest Plane? Most gigantic swimming pool? Take a look at these and don’t miss #9!!! #1 – World’s largest office building The Merchandise Mart, Chicago, Illinois.USA. (So large it has its own Zip Code: 60654) 414shares Share Tweet Flip Join the conversation! We have no tolerance for comments containing violence, racism, profanity, vulgarity, doxing, or discourteous behavior. If a comment is spam, instead of replying to it please hover over that comment, click the ∨ icon, and mark it as spam. Thank you for partnering with us to maintain fruitful conversation.