Does anyone know where to get good collections of these sorts of things? For sound effects I was thinking of monsters growling, creepy eerie sounds, screams, medieval combat sounds, etc. For pictures I was interested in actual photos or good artwork of real things, like old graveyards, ruins, cathedrals, underground passages/cities, overgrown forests, etc, which could be shown to players to give them a sense of how the area looks.
Are there any such collections out there? Anyone care to share their own personal collections? Even links to threads on boards, or blogs, would be helpful.