Castle at night

we had popped over to Broughty Ferry tonight and parked near the harbour, There were no lights on the castle and it just looked like a silhouette, however, when I set the camera up for a long exposure , the evening light and street lights around the harbour allowed the camera to get as much detail as possible, making it look all the more eerie , Keeping the ISO to 100 ensured there was not too much noise in the image, Incidentally the green light behind the castle is a navigation aid for Marine vessels on the River Tay and gave a wonderful reflection on the harbour in front of me!