Here's another fish eye shot where I am close to the wall and using it as a leading line towards the building. The distortion in the majority of the shot is less because I was holding the camera level with the ground. I had to wait a while before the sun came out again for this shot but the clouds were starting to clear quite nicely by now.
I moved very close to the building for this next shot as I was still using the fish eye. The distortion is more prevalent as I was pointing the camera towards the ground a little which makes the edges curve upwards.
Next I went outside the castle and headed around the back of the building I had been shooting. I had changed the fish eye to a normal standard lens as I was further away from the subject. Here I was well below the castle and got a sense of how imposing it would have been for any attackers when it had been in use as a defensive building.