Latest video from Vox's "The Darkroom" about trying to recreate Mumler's famous portrait of Mary Todd Lincoln with the ghost of Abraham behind her. Found this quite interesting as I did a lot of research as a university student on a local Winnipeg doctor who did the same thing around the same time (he was not as famous/notorious of course).
Well it seems that my other favourite Youtuber did a video on the same subject (quite coincidentally). It's a different take but has a nice historical photography focus as well, albeit with a different take to the Vox video.