The survey covers more than 700 castles and castle-like buildings around Scotland. Pictured here is Craigievar Castle
Stirling Castle from The Castellated and Domestic Architecture of Scotland
In the 1880s, two busy Edinburgh architects embarked upon an enormously ambitious project. David MacGibbon and Thomas Ross began to survey, measure and sketch the castles of Scotland, travelling the length and breadth of the country on trains, bicycles and on foot, working at weekends when they could get away from their office.