These ruin are very close to the city center so worth the short walk to get there. You cannot walk down to it unfortunately, but the view from above is very nice and leaves you with a bit of mystery, imagining what the inside looks like. The place is an old flour mill from the 13th century and is surrounded on either side by two rivers.
When we were there in July, the greenery that you may see in pictures online wasn't quite at its peak. I am not sure when the peak time is, but it was still great to see. The view point is not marked or anything, but is along a narrow sidewalk with sometimes busy traffic going by so be careful. We spent less then 5 minutes there. read more