Photos of ruins and structures from past eras

What is a ruin? We're running off of "You know it when you see it" at the moment. Ruins should be non-functioning structures of some age, or their function reduced to tourism and the like. Generally speaking, specific items from a ruin should go to [email protected] Illustrations of ruins (or their reconstructions) should go to [email protected] Photos of ruins back when they were functioning should go to [email protected]