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It's one of Stonehenge's greatest mysteries: How did Stone Age Britons move 45-ton slabs across dozens of miles to create the 4,500-year-old stone circle? ...A previous theory suggested that the builders used wooden rollers -- carved tree trunks laid side by side on a constructed hard surface. Another imagined huge wooden sleds atop greased wooden rails. But critics say the rollers' hard pathway would have left telltale gouges in the landscape, which have never been found. And the sled system, while plausible, would have required huge amounts of manpower -- hundreds of men at a time to move one of...

Stonehenge Didn't Stand Alone, Excavations Show James Owen for National Geographic News January 12, 2007 Recent excavations of Salisbury Plain in southern England have revealed at least two other large stone formations close by the world-famous prehistoric monument. One of the megalithic finds is a sandstone formation that marked a ritual burial mound; the other, a group of stones at the site of an ancient timber circle. The new discoveries suggest that many similar monuments may have been erected in the shadow of Stonehenge, possibly forming part of a much larger complex, experts say. The findings were part of the...

Great Riddles in ArchaeologyWednesday Evenings, October 2011 through June 2012 From the knights of King Arthur’s roundtable to the deepest depths of Atlantis, some of the world’s greatest archaeological riddles have eluded us for centuries. Discover and explore these mind-boggling riddles in the next season of the Penn Museum’s popular monthly lecture series presented by current archaeologists and scholars. Mark your calendars for Great Riddles in Archaeology, offered the first Wednesday of every month, October 2011 through June 2012. General Admission is $5 per event in advance or $10 at the door. Subscriptions to all nine events are available for...