Silbury Hill, part of the complex of Neolithic monuments around Avebury in Wiltshire is the tallest prehistoric man-made mound in Europe and one of the world's largest.
Silbury Hill, part of the complex of Neolithic monuments around Avebury in Wiltshire is the tallest prehistoric man-made mound in Europe and one of the world's largest.
Ancient 
http://www.dailymail.co.uk/sciencetech/article-1213400/Ancient-man-used-stone-sat-nav-navigate-country.html