A retired carpenter in Flint, Michigan, thinks he's figured out how Stonehenge was made using no wheels, rollers, or machines. In his experiments, he's devised a way to pivot (and move as much as 300 feet vertically) objects ranging in size from a minivan-sized chunk of stone all the way to a 30 x 40' barn—by himself. He also created a teeter-totter-esque jack (shown here) to raise an obelisk. His website: The Forgotten Technology. And a video on his work.
at 2:02 PM