In the times of double glazing, frostwork has been something I only knew from tales and images. But on one particularly cold winter day, I found out that triple glazing might give the experience back: our bedroom window was still tiled partly open, as usual, and the outer pane got cold enough to get frostwork, although on the outside.
The fountain of Maulbronn cloister where pilgrims came for water made famous by the founding of the cloister. It's a very serene, beautiful place (provided you don't get trampled by tourists).
Another fountain with water moving very quickly.