Adam Stanford/Aerial-Cam Ltd

Stonehenge may have been built with second-hand stones

Archaeologists have traced Stonehenge’s bluestones—the dark, dolerite pillars of the great monument—to quarries, shown above, located 140 miles away in Wales. Now, researchers have carbon-dated the Welsh quarries, and concluded that some of the giant stones, weighing up to 4 tons each, were apparently excavated as early as 3400 B.C.E., about 500 years before Stonehenge was built in the United Kingdom’s Salisbury Plain. The Guardian reports that these bluestones may have been part of an older monument in Wales that was dismantled; some of the stones were then carted to Stonehenge. 

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