To add to the other post about the houses without signs, I wish to add when you add a teleporter to the Pyramid of the Lost Horizon it positions it backwards, so making your character face the exit of the castle. Is this something or is it the only castle that does that?
I'm guessing you're talking about the green/white/red...etc craftable teleporters??
If so, when you are placing them down, you'll notice an arrow on them, before you click to actually place it, roll your mouse wheel, until the arrow points in the direction you want to exit the teleporter.