We can learn a lot about early films from producers' and exhibitors' catalogues, in contemporary accounts in newspapers or the trade press, or by examining the original celluloid film. But try as we might, archivists and historians sometimes draw a blank. Where and when was this film shot, and who by? Is it British? French? American? Egyptian? 

We've collected here some of the earliest films in the BFI's collections, which we wish we knew more about. So grab your deerstalker and your magnifying glass, and put your observational skills to the test on this enigmatic assortment. Can you recognise a building, a landscape, a military uniform?