Minecraft wiki entry for Stronghold, associated text: The side view of an uncovered stronghold.
Overhead view of an uncovered stronghold.
Top view of an uncovered stronghold.
A stronghold generated on Superflat using Customization GUI in 12w40a/b.
An underground view of the top of a stronghold.
An end portal room generated partially above sea level, noted by the windows.
An underwater end portal room with no other rooms.
An underground view of the bottom of a stronghold.
An iron door in stronghold.
Many stone bricks in stronghold with an iron door on it.
Ravine with multiple ores, water and lava falls, and stronghold bridge over it.
Desert pyramid, mineshaft and stronghold generated together.