Standing 30 metres high and 160 metres wide, Silbury Hill in England is one of the world's largest man-made prehistoric mounds. It was constructed in the Neolithic, about 25 kilometres north from Stonehenge.
Silbury Hill Construction
It is estimated the construction of Silbury Hill involved half a million tonnes of material and around four million man-hours of work – equivalent to about ten years for a crew of a hundred people working 7/7 for more than ten hours a day.
New and more precise dating of materials found inside the hill now suggests the main construction happened in about 100 years, involving some three generations between 2400 and 2300 BC – right after nearby Stonehenge's thirty enormous sarsen stones were put in place.
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