An aerial photograph of the Iron Age hill fort at Yarnbury, Wiltshire in England. The remains of an earlier structure show up inside the main ramparts.
The remains of human activity can sometimes be seen from the air, even when they are buried underground. In dry weather crops may grow poorly on thin soil lying over buried buildings and roads. Or crops may grow unusually well in the deep soil that is the result of long-forgotten pits and ditches being filled in over the years. Either of these effects can reveal signs of ancient settlements when they are photographed from the air.
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