ARCHI UK is "a regularly updated subscription database of more than 190,000+ British Archaeological Sites covering the whole of England, Scotland and Wales. It includes an app that helps when you are out fieldwalking."
"It has a set of 52 rare English County old maps dating from 1724, very old maps of Ireland and a Saxon map of London. The image gallery includes old photographs of archaeological, ancient and historic sites including the 1st ever aerial photographs of an archaeological site - Stonehenge from a ballon in 1906." However they do not seem downloadable in high quality.
