I'd post a pic of my castle, but every time I try to upload the pic my computer freezes (issue with the firewall perhaps?). Nevertheless, my castle had all the essentials: huge lighthouse (works as a navigational beacon), underground farm, cobblestonefactory, mining complex, mob trap (with effective spawn area of 1512 square blocks), lots of storage space and elevated rail system to my other fortress. Also my spawn point was in my castle. Anyway, the funniest thing happened yesterday. I was playing Minecraft, when my computer froze up. No matter, I thought, as it was only a few minutes since I last saved. I started up Minecraft again, only to find that my whole save file was gone (yes, this was the one with my castle)
EDIT: I started another game and the same thing happened. Turns out that the saves weren't gone, when a starting a game in the same slot it loads up my old save(s). It does change my spawn point though and I lost all the stuff I had on me