According to YouTube user Nomadic Fanatic, the world's largest ball of twine is right here in Superior, WI.  He made this video last week highlighting the giant monstrosity of twine and talked to the creator.  Check it out!

He claims that he googled it and found it in Superior.  I've been trying to find some verification but I've been coming up empty handed.  Unless for some reason this is the world's heaviest ball of twine which is in Lake Nebagamon WI (according to wikipedia) , and he got his location wrong.  Either way, that's a massive ball of twine!