Silbury Hill, Prehistoric mound in Wiltshire, England
Silbury Hill is a prehistoric mound in Avebury, Wiltshire, built from layered chalk, clay, and gravel that rises to around 40 meters. Its flat summit and evenly sloped sides reflect careful planning during its construction in the Neolithic period.
Work began around 2660 BC and required an estimated 18 million hours of labor from roughly 700 people over ten years. Archaeologists have identified three successive building phases that gradually enlarged the mound.
The name likely derives from Old English "Seleburg" and points to an early connection with a nearby settlement. Local legends often link the mound to King Sil, a mythical ruler whose burial was believed to rest here.
A small parking area beside the A4 allows a short walk to the viewing point where the mound is clearly visible. Climbing onto the surface remains forbidden to protect the structure.
Early excavations in the 18th century created tunnels inside that were later filled to prevent collapse. The first phase contained wooden posts and earth before reinforced chalk walls were added.
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