Joining Alan for another history mystery episode is Dennis Stone, President of America's Stonehenge, a privately owned archaeological site. Built by a Native American Culture or a migrant European population? No one knows for sure. A maze of man-made chambers, walls and ceremonial meeting places, at over 4,000 years old America's Stonehenge is most likely the oldest man-made construction in the United States. http://www.stonehengeusa.com/
Like Stonehenge in England, America's Stonehenge was built by ancient people well versed in astronomy and stone construction. It has been determined that the site is an accurate astronomical calendar. It was, and still can be, used to determine specific solar and lunar events of the year.