This is not unusual in general… My cottage in wales is built smack atop a roman road, and the garden follows the line of the agger. At some point it degraded s

This is not unusual in general… My cottage in wales is built smack atop a roman road, and the garden follows the line of the agger. At some point it degraded so much that people started walking in the roadside ditch instead, which is now a holloway. I have a friend in Bath who has an extremely fine Roman mosaic under his basement floor - found during construction a few centuries ago and they just left it in situ, put clay atop it and laid flags. He rediscovered it about 15 years ago when they pulled the flagstones up to put in a damp-proof course. Likely part of the baths complex as his house is a stones throw from them. Archaeologists documented it, and it was then buried under sand and a damp-proof course. He’s still got damp down there.