9 World’s Largest Buildings, Planes and More By Tami Jackson - August 13, 2013 416shares Share Tweet Plus Pin Link Link Digg Print Email 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) 416shares Share Tweet Plus Comments Pin Link Link Digg Print Email Join the conversation! We have no tolerance for comments containing violence, racism, vulgarity, profanity, all caps, or discourteous behavior. Thank you for partnering with us to maintain a courteous and useful public environment where we can engage in reasonable discourse.