A team of archaeologists have found “hidden” remains of prehistoric buildings and fields on Skomer Island, off the Pembrokeshire coast.
Using new technology, they “X-rayed” fields and found buried ditches and structures not visible on the ground.
Dr Toby Driver from the Royal Commission on the Ancient and Historical Monuments of Wales said they may date back 5,000 years.
He added they are among the best preserved anywhere in the UK.
Skomer Island is a national nature reserve and famed for its bird life and puffins.
It also has remains of prehistoric houses and much of the island has been designated an Ancient Monument.
But nobody had carried out any archaeological studies of the island since the 1980s. Read more.