The Mystery Flesh Pit National Park is a detailed speculative fiction project created by artist Trevor Roberts, starting in 2019. It centers on a fictional Texas tourist destination located within the Permian Basin Superorganism, a massive subterranean creature. The meme often revolves around the contrast between wholesome, 1970s-style National Park service branding and the visceral, existential horror of the creature itself. Users employ the template to satirize corporate greed via the fictional Anodyne Corporation, highlight ecological disasters, or simply lean into the liminal space and analog horror aesthetics. It has grown from a niche Reddit project into a major internet lore phenomenon, blending environmental satire with body horror.