Acclaimed author and presenter of BBC’s ‘Scotland from the Sky‘ James Crawford introduces his favourite abandoned or ruined sites across Scotland, many of which can be visited as part of a walking exploration. Today, we live almost entirely among the physical impression and presence of the past. Often it emerges in the shapes of our towns and cities; in the ways our fields look; in the bare reaches of our sheep-wandered hills and moorlands. Some ancient or historical sites have even been afforded special status, segregated from the present to be offered up as preserved, curated ruins and tourist attractions;…