Authors of 'Giants On Record: America's Hidden History, Secrets in the Mounds and the Smithsonian Files' Hugh Newman and Jim Vieira explore America's Stonehenge in Salem, New Hampshire. It used to be called 'Mystery Hill' and is dated to as far back at 4000 years and has many astronomical alignments and megalithic constructions, and no one is sure who built the site at such an early date. http://www.stonehengeusa.com/. Subscribe to Hidden Knowledge TV at: https://www.youtube.com/c/HiddenKnowledgeTV https://www.facebook.com/giantsonrecord. Get the book or Kindle at Amazon US: http://amzn.to/1MrVH5L and Amazon UK: http://amzn.to/1OxghHM and other outlets. Filmed and edited by Hugh Newman. Copyright Hugh Newman 2015/2017. All Rights Reserved. http://www.hughnewman.co.uk