The day started with clear blue sky and 1 degree C (33°F). However, by the time we got to the castle village, we were in THICK fog. We parked and hiked up the hill on a muddy trail through the woods, not really sure we were heading the right direction, because there was poor signage, and we couldn't see anything for the fog. I kept thinking I saw the start of a castle, only to discover it was merely more trees or rocks emerging from the mist.
We did eventually get to the first castle, however: Le Château du Petit-Ribeaupierre:
The view from the castle, over the beautiful Alsatian valley & countryside:
(well, not quite visible today; maybe next time)
The only way into the castle:
A fun place to scramble around (though I prayed hard for safety climbing up and down (narrow ledges on a steep rock face in the fog), and was thankful for safe passage granted, by the Designer of gravity, hands, feet, and rock - thanks again).
Fortunately, the Collégiale Saint Martin (below) was open, and we had a few nice moments touring the inside.