While the summer drought has left fields and gardens parched, it has opened up aerial architectural treasures across the country.
Photographs taken from light aircraft have revealed hundreds of unknown or long forgotten sites. Archaeologists now face a busy autumn, interpreting images that will help shed light on how people lived up to 6,000 years ago.
Dr Toby Driver, of the Royal Commission on the Ancient and Historical Monuments of Wales, said: "It has been a hugely successful year for aerial archaeology. We may not see another like it for a decade.
"I now have months of work to go through the discoveries, notifying local archaeologists and ensuring that some of the most remarkable sites are visited on the ground and studied further."
Among the most significant finds are two 6,000-year-old Neolithic causewayed enclosures near Walton, Radnorshire, and near St Athan airfield, in the Vale of Glamorgan.