Dungeon

Dungeons are naturally generated underground structures that might be added in a future update. Dungeons are small rooms with a monster spawner in the middle, and some chests that contain valuables and rare items such as diamonds. The mobs spawned in a dungeon can spawn a zombie, a skeleton, or a spider (spider-jockey). This can be prevented though, by placing a torch on the spawner.

Trivia

 * Dungeon are very hard to locate, though they can be located by listening for mob sounds underground.
 * Sometimes, dungeons may not contain chests at all.