America's Stonehenge sits atop Mystery Hill in North Salem, New Hampshire. It is an acre of stone structures surrounded by a 12-acre calendar. Alignments and carbon dating indicate the site was built 4000 years ago. In this book the authors explore the historical and prehistoric clues left behind at the archaeology site once described as a 'mystery wrapped in an enigma'. The history of the site is examined and traced from the clues left behind from visitors, residents and researchers, and how that has led to today's research and the current interpretation of the evidence.