Features include full castle walls, castle keep, lava moat on 2 sides, water area on other two sides, wheat farm that self-harvests with a single bucket of water, healthy mine, bamboo farm, self-harvesting cactus farm, lava pillars, tree farm, mushroom farm, under-castle jail, underground connections to all of the above, creeper statue, and a deep underground "Stargate" room (24X26X30) with working portal to the Netherworld.
This started out as my personal world. I then moved it over to a multiplayer world so my wife could play with me as well. Our buddy then joined and has added as well.
All of this has been built and all materials gathered legitimately.