So the scenario for my story involves an abandon castle that is located in a taboo area so no one goes near it and so no one is maintaining it anymore. Assume the castle was almost 1000 years old before it was abandoned, but it was well maintained up to the point of being abandoned. There is no magic or anything special about the castle that would allow it to survive any longer than normal.
- How long before the castle is no longer capable of serving as a castle (like walls have been compromised or the roof has caved in)?
- How long before the castle is nothing more than a pile of rubble?
- Would being near a forest and/or river expedite the process and if so by what order of magnitude are we talking?