Aztalan State Park
A fascinating archaeological site found between Lake Mills and Johnson Creek, Aztalan contains the ruins and artifacts of an ancient village that thrived on this spot between 1000 and 1300. Then it was mysteriously abandoned, and no one knows why. You can view the bones and left-behind possessions of the hundreds of people who lived here, and learn about their lives and how they thrived. Rediscovered in 1836, it became a National Historic Landmark in 1964.