one of the most enchanted, inscrutable, maddenly beautiful structures ever created by man. built atop ninth-century fortifications by the nasrid dynasty, and added to and added to as history unfolded through wars and tragedy and invasion and conquest. >> zack: on the outside, it's very bare. all you see is these tiny windows. >> anthony: right. >> zack: and it's projecting impenetrability. but then you come in here. >> anthony: zack has gone, well, let's call it what it is -- a bit mad about the place. the details, and there are a lot of them, can obsess a man. plus, he's a cinematographer, so you can understand once you start to really look around how that might get a grip on a guy whose profession is the intricate play between light and darkness. >> zack: my theory is that they were trying to weave nature, calligraphy, symbols. these are all inscriptions within here. inscriptions turned into graphics. you know. >> anthony: right, because, uh,