This is a goblin underground town, done in "The roofed Forest" Better Biomes by Geeraf. It is not very large but you can apreciate the detail in every place you look. The texture pack is Conquest, you can dwnload it here:  http://resourcepack.net/conquest-resource-pack/ The download is avove. I also included a schematic of a small low-level goblin house. If you explore enough you will find a very cool treehouse (secret)