Ruins is a mod that spawns Structures in your Minecraft worlds upon generation, similar to Villages or Strongholds. Every Structure is defines by a template and configured to spawn under specific conditions, and all of that can be changed by you!

There is a lot of Structures already included, and there's bound to be more added.

For more info go to the forum of minecraft: http://www.minecraftforum.net/topic/1113099-

Required Stuff to have installed beforehand: Forge

1. Make sure you followed the Forge installation instructions.
2. Best testlaunch minecraft once before installing this.
3. If the file you downloaded IS NOT a .jar, if it is an archive, you NEED to open it and find the installation instructions inside.
4. Drop the downloaded file into your .minecraft/mods/ folder.