c. 1900 BC
Martlesham Heath
Bronze Age burial mounds known as round barrows, like this one at Martlesham, are the earliest, visible, humanly-made features in the Suffolk landscape.
Further reading
Lawson, A., Martin, E. and Priddy, D., The Barrows of East Anglia, East Anglian Archaeology no. 12, 1981 http://eaareports.org.uk/publication/report12/