Berg Sponeck - https://goo.gl/maps/s8dvktGKDeTQtn5R8Nice pics! - Especially the last one. I do love me some cool castle/tower. I assume it's somewhere close to Freiburg, but where exactly?
What’s been nice is if I want to go somewhere on the weekend, I just search for “ruin” or castle or whatever and there’s always something. I love it.