We stopped for the morning in the little village of Durstein, which is set on a cliff above the Danube.  I went exploring the town on my own and had some issues finding my way up into the village itself and I lost some time doing it.  Once I got up there and saw the village I found out there was a castle ruin above the town I could climb to.

I took off to climb to it with limited time to get back to the boat before we set sail for Melk.  It was a really steep climb and I made it about 75% of the way there before I ran out of time (and maybe wind).  I got some great views that really show up in the video