The Undead demension

The Undead Dimension consists of GIANT dungeons and lots of villages, filled with undead life.

And there are giant ruined structures dedicated to undeaed mobs, Example: A skeleton town filled with skeleton statues and LOADS of skeletons and a massive 10 block tall skeleton that drops a costume that allows you to blend in with skeletons. this should be the same with zombies and other undead mobs.