New Dungeon Ideas?

Cmon, we need more adventure in Minecraft. Let's post some cool structure/dungeon ideas below!

96.227.94.194 (Creator of page): a Mausoleum dungeon. It would contain new mobs, and also graves.

TheUserNamedT: Quartz Castle. Spawns in the Nether. Very tall, and made of quartz. (Of course.)  Zombie Pigmen in golden armor will spawn, as well as gold blocks scattered as decoration.