Went walking at Forest of Gight and came across the ruin of the Castle of Gight, which used to belong to the Gordons. Unfortunately they ran out of money and it was sold to the Earl of Aberdeen in 1797. By the early 19th Century it fell into disuse and ruin. It still has the outline and some of the features of a Scottish Castle though, and I went in to explore having read the warnings and disclaimers - but I was careful.
From inside I took a couple of photos - one looking up the ruined round tower, and the other through a side window that looked like a stone picture frame.
Here they are: