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Here's a castle I made... it is about half furnished and I believe there is a chest of infinite items somewhere in there.
The .schematic file format was created by users to store sections of a Minecraft world for use with third-party programs (specifically, MCEdit, Minecraft Song Planner, Redstone Simulator, and WorldEdit). Schematics are in NBT format and are loosely based on the Indev level format.
Please see the individual application above for usage instructions.