Generated Structures

Generated Structures are naturally spawned structures. These include Caves, Villages, Abandoned Mineshafts, Strongholds, Lava Pools, and Ravine. All of these were be added to Update 0.9.0.

Villages
Villages are above-ground structures with houses, farms, etc. They almost always contain Villagers. Villages often have blacksmiths. There are always chest with items inside.

Strongholds
Strongholds are sometimes above-ground and sometimes below ground. They are large, having many wings, rooms and halls.



Lava Pools
The name is quite self explanatory. Lava pools are small pools of Lava that spawn randomly in the world.

Abandoned Mineshaft
Abandoned mineshafts are small mineshafts, often with Rails and Chests. They are often connected with Caves. They contain Cave Spider spawners (spider spawners in PE)

Ravines
Ravines are long and narrow cracks in the world. Ravines often lead off to caves. Ravines were not added in 0.9.0.

Trivia

 * Before Update 0.9.0, there were no generated structures.
 * Caves, in extreme cases may count as an exception, as they can sometimes generate in pre - 0.9.0 seeds such as nyan.