RCAHMS collections have been developing since the organisation was established in 1908. From the earliest years, staff prepared drawings or took photographs and people regularly gifted material to help with the creation of the ‘inventory’ of monuments. RCAHMS now holds over 5 million drawings, photographs, negatives and manuscripts relating to Scotland’s archaeology, buildings and maritime heritage, and, through the National Collection of Aerial Photography, over 20 million aerial images of locations around the world.