Board Thread:Questions and Answers/@comment-8198876-20130414191313/@comment-69.35.184.186-20130901192929

I've once found a weird conglomeration of dungeons, arranged in a near perfectly rectangular fashion with divided rooms, it was made of basic dungeon materials and had 15+ spawners, and some were ones ( for example endermen ) that wouldn't occur outside a mod. I've never seen another one and can't provide screenshots as this happend before the launcher updated and labled this version as "Classic". Does anyone know what the proper terminology for this structure is? and what mod(s) caused it to generate?