In various episodes of Game of Thrones we get to see visions, for example, in Qarth, when Daenerys Targaryen enters the House of the Undying, or many of Bran's visions. However, I think there are more mentions of visions seen by the followers of R'hllor than any other vision. However, try as I might, during the times when Melisandre says she is seeing something in the fire, I never do. (I'm plodding through all the episodes again, and I've reached season 4, so I'm fairly certain no fire till then shows anything unusual.)
Do we, the audience, ever get to see anything in the fires? If so, when? If not, why not?