<Li> In the 1996 movie Michael, starring John Travolta as an angel on holiday on Earth, his character requests to stop and visit the biggest ball of twine that was supposedly located somewhere in Iowa . </Li> <Li> In the 1983 movie National Lampoon's Vacation, Clark Griswold (Chevy Chase) tries to entice his reluctant kids back into the family station wagon with a promise to take them to see "the second largest ball of twine on the face of the earth, which is only four short hours away ." </Li> <Li> In the 1943 story The Mystery Yarn, part of Robert McCloskey's children's book Homer Price, two male rivals for a lady's affection, both of whom have string balls that are nearly six feet in diameter, stage a public contest to unravel the balls; they agree among themselves that the loser will be required to desist as a rival; however, the lady outsmarts their plan . </Li>

Where is the largest ball of yarn located