Minecraft wiki entry for Multiplayer_PvP_bases, associated text: The answer for you? Nether transport! First, get enough obsidian and/or molding supplies to make two portals. Next, make sure there's no one in a 100-block radius of your soon-to-be base. Then, pillar up about two hundred blocks: not really necessary, but it's a nice height. Sure, you can't really see the ground, but people will need a LOT of dirt to get up there. After that, make a Nether portal up there. You then want to go about sixty-four blocks away from your location. Make another portal. Go through it, and back in the Overworld, cover it up using dirt or something to make a convincing, small hill. Go back through your portal and make a walkway to easily get between your portals. You may wish to disguise it later, but it's fine for now. Go back through your sky portal and you'll end up on top of your pillar.