What is the prehistoric monument on salisbury plainwiltshireengland?

Pre-historic monument on Salisbury Plain, southern England, consisting of two concentric circles of large standing stones. Stonehenge built of megaliths, constructed of large stones used to build different structures during the prehistoric period (Archaeology)megalithic large standing stone, large stone used in prehistoric construction. (Archaeology)megalith area between concentric circles, ring; ring-like object, ring-shaped partannuluslong upright stone placed as a monument in ancient times, single standing stonemenhirdescribing vision, formed of large unhewn stones fitted closely together without the use of mortar or cement (Architecture), like the Cyclops, made of big stones.