No specific resource here, but a search strategy. A great way to find pictures that resonate with fantasy writers, at least ones who incline toward epic fantasy, is to find 19thc pictures. That was the heyday of detailed, overly-Romantic images of the past. So I do this. steel engraving <topic> Sometimes useful is 19th century painting <topic> but that's a little more hit-and-miss. And, finally, to find both text and pictures, try this one illustrated history of <topic> The Net is a wonderful place.