Delve into the inexplicable mysteries of Stonehenge, a remarkable monument that took over 1,000 years to build. | Ancient Aliens

Last month, new scientific research by Curtin and Aberystwyth Universities revealed that the Stonehenge Altar Stone originated from the Orcadian basin located in north-east Scotland, rather than Wales as previously thought. Now more a recent study from Aberystwyth University has found the stone did not come from the Orkney isles, and so the quest for the origins of the six-tonne stone continues on the Scottish mainland... | Stonehenge