Silbury Hill is a prehistoric man-made mound near Avebury in the English county of Wiltshire. It is part of the Stonehenge, Avebury and Associated Sites UNESCO World Heritage Site.
Silbury Hill had a 40 meters high (131 ft) which makes it one of the largest in the world. The original purpose of construction of so high hill is still unknown but there are many theories from representatives of the official historical schools and from the New Age philosophers and writers. Independent researchers of ancient civilizations do not have a big interest in Silbury hill because there are no any evidences of ancient high technologies. But it’s the biggest mound in Western Europe.
It was constructed from soil and clay excavated from the surrounding area. Archaeologists stated that Silbury Hill was built about 4,750 years ago and that it took 18 million man-hours, or 500 men working for 15 years to deposit and shape 248,000 cubic meters of earth and fill on top of a natural hill.
The base of the hill is circular and 167 meters (548 ft) in diameter. The summit is flat-topped and 30 m (98 ft) in diameter. At first a smaller mound was constructed, and in a later phase much enlarged. The initial structures at the base of the hill were perfectly circular: surveying reveals that the center of the flat top and the center of the cone that describes the hill lie within a meter of one another.
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