Minecraft-Dungeons

While mining you may hear a spooky song (not to get confused with the Ambience) if you find cobblestone, than congrats, you found a Dungeon. Dungeons contain the following

1.A monster spawner

2.Lots of Mossy Rock (rare)

3.A chest filled with goodies

There are 3 types of monster spawners

A Zombie Spawner

A Spider Spawner

and A Skeleton Spawner

Dungeon chests contain various items ranging

from Buckets to Golden Apples (Very Very VERY RARE)

Entering a Dungeon on peaceful makes monster spawners fail to spawn mobs, however you may hear

the mob because mobs spawn then despawn on peaceful. If you obtain a Monster Spawner through mods or such a Monster Spawner will only spawn pigs.

CREDIT TO MINECRAFT WIKI FOR PICTURE