Mystery Flesh Pit National Park

The Mystery Flesh Pit National Park is an enormous superorganism burrowed below ground in Texas from an ARG of the same name. The ARG has a huge amount of worldbuilding, and would serve as a good idea of the bad things that could happen if humanity, especially corporations, tried to take advantage of a massive Lovecraftian entity, particularly useful for games like Delta Green or Masque of the Red Death. The Mystery Flesh Pit is also referred to as the Permian Superorganism, and is so large it has its own ecosystems of parasites within it.