Lost archaeological sites have emerged in grasslands across Wales after a prolonged spell of hot and dry weather. Wales has seen about 5% of the average rainfall for July, after a series of back-to-back heatwaves and a drier than usual April to June. A drought has also been triggered in parts of Wales. Experts said these dry conditions have brought to light a range of hidden archaeological remains, including Roman buildings and practice trenches from World War One. Many are only visible from the air as distinctive marks in crops and grass, with some not being seen for "two or three decades", according to the Royal Commission on the Ancient and Historical Monuments of Wales (RCAHMW).