I know I already posted this but I found it in-game with no hacks or modding.
Anddddd
Damn, I deleted my good world.
Well I built a 30x30x30 dungeon of DOOM about 15 squares off of the ground and monsters actually spawned in it because it was so dark. I got owned a few times in there by fucking skeletons RIDING spiders. Fuck.
Here's the only screenshot I got of it.
And Here's kind of an idea of what my previous DEATH FORETRESS which I owned the shit out of everything alive in.
And my epic waterlavafall.
I feel pretty bad for deleting this world now.
I built three legit-ass bases and like four more little outposts, I knew where they all were, and I built a goddamn glass bridge with a lava floor across the ocean. I even had an underwater entrance to once base and then a whole fucking base underwater along with a portal to the Nether. Damn.