Check out a 67-foot-high tree made of wagon wheels; view the world's largest four-sided clock, the biggest penny, and most massive loon; and wander among 200 concrete statues of cowboys, Native Americans, and animals. Hunt for the Cornish Knockers at the Badger Mine Museum, pay a visit to the Houdini Historical Center in Appleton, or see the world's largest muskie soaring above the trees at Hayward's National Fresh Water Fishing Hall of Fame.