Spent part of my childhood living in a nearby town (Wiesloch, which we got to by going through another called Nußloch - literally translated as "nuthole" which amused the heck out of me as a kid), while going to school at the Internationale Gesamtschule Heidelberg. Loved the castle. Like most, I'm quite nostalgic for that time & am so glad I got to spend so much time in Germany.
TY for the trip down memory lane, even if not exactly these places.