I’ve seen some small castles in my time, heck, I’ve even built some, but this island castle by Nikita Filatov has got to be one of the smallest. The minifigure binoculars are great as tiny towers, but my favorite part is the rounded white tile balanced on the back of an ingot. But the great techniques don’t stop there. The water base is made with studs-not-on-top connections which adds a bit of visual weight to this microscale build.
I don’t think it counts when none of the pieces are connected together, aside from the water base.