Stonehenge - did Aliens build it?

Stonehenge is a Neolithic vested in the least to the Bronze and currently used in thebuilding near Amesbury in Wiltshire, England, about 13 miles north of Salisbury. It is agrave condition, which surrounds a Megalithstruktur, which in turn is formed from a plurality of concentric stone circles. The two most striking stone circles are an outer circle of stones,pillars, which are bridged by capstones, and an inner horseshoe-shaped structure from the original five Trilithons (two support stones, which are bridged by a capstone). In between are other structures of smaller stones and holes in the ground. Other megaliths, two burial mounds are found in close proximity. 

The origin of the plant can be divided roughly into three phases. The early phase of the plant, having a circular rampart and a ditch, dated to about 3100 BC. The strikingMegalithstruktur was approximately between 2500 BC and 2000 BC built. The entire system is probably much older than previously thought. Accordingly, the Megalithstrukturwas already around 3000 BC