Tintagel Castle, Cornwall
The second picture is the cove and Merlin's cave. I can be literal when I say, that view is the reason that the story exists.
[Here is something you may not know about me; I'm not spatial, and I am not map oriented and pictures are really impossibly difficult for me to work with in my head; basically, to get a mental image, I have to have a.) have been there or somewhere similar or b.) have read something with a clear description. Option c.) it counts as me being there if the characters wander around it for a while and I can get a three dimensional image.]
Near the bottom of the page is a black and white with clearly labeled areas, in case you are like me and need lots of spatial references to places you haven't been. No, apparently these are not snatchable at all, which is why I didn't use them for illustration, and trust me, I was this close to offering some sort of sexual favor to anyone in the greater Cornwall area to go and take pictures for me so I could get a better feel for a place that does not exist only in my imagination. I mean, really close. I love that cove. Everyone should be relieved I didn't get desperate enough on Sunday night to hunt up a pencil and try to sketch the damn thing. I am not artistic and I am not spatial. It would have ended in tears.
Somewhere--and I cannot find it, but if you do, link me!--is a 360 walk-through of the entire place, which I could not find to be sure of my blocking of how Merlin and Arthur get from the village to the castle via the cove, but you know, fifteen hundred years ago. There's also the stone arch and an impression of the bailey at that site, though keep in mind that this particular Tintagel is the ruins of Richard of Cornwall's castle during the reign of Henry III, and not the actual ruins of the original Tintagel, which I totally believe exists and no one can tell me differently.
Also referenced: wikipedia. Is there nothing wikipedia does not know?