I have been collecting images of Mithraic monuments from the web and identifying them, and adding them to my Mithras site. It’s fun; and there are more to do.
I’ve also written a short section in the site on Mithras and the Taurobolium. Did the cultists of Mithras perform the taurobolium, a ceremony of being washed in bull’s blood? No, they didn’t. Or, if they did, no evidence records it. It’s a ritual of Cybele, not Mithras.
Jolly useful to find that I had a PDF of Duthoy’s monograph on the taurobolium on disk when I needed it!