This is Dracula's Castle 1999. There is a complete map to be overlaid on top of it designed to follow details on my story, but ALSO to be used if a fangame ever comes from it. I won't show the internal map yet, but believe me: It's huge. But I'll show you this:
The general shape of this castle, if no one notices, is a homage to the NES Castlevania's map. It happened that my story-game system required the Clock Tower to be at the center of the castle, and that I wanted it to be divided into two very separated wings, so I made a full-on homage.