In 1797 Alucard states that the "castle is a creature of Chaos; it may take on many incarnations." We know this as fact, since no castle in the series has ever taken the same shape (with some exceptions). It can be argued that the 1999 castle will look similar if not identical to the torn, half-destroyed castle we see in 2035 (but for the sake of gameplay purposes, I certainly hope not!).
I guess my question is, how did the castle come to be? We know that some form of it existed before Dracula became ruler (as seen in 1094). Dracula excels in black magic & can create monsters, but are his powers also responsible for the ever-changed Demon Castle? I don't think so, since the castle can still exist without him even after Dracula has been "sent to the Abyss". Who writes the rules for the castle's state of being?
We see characters such as the Librarian, who obviously has a history with Dracula & his son, & seems to know the exact purpose of the Demon Castle's existance. Wouldn't it be interesting if he had some role to play in it's creation?.. I would hope so, but isn't likely since we've only seen him once. Maybe St. Germain will clear things up.
I'm aware that there are essentially 2 castles (as stated by Graham, and others). But we still are left with many questions as to the grand design. Death could be the almighty architect.. is this a fair assumption, or am I just grabbing at straws..
Thoughts, comments, criticisms?