We carefully scraped the mold from the walls. It didn't mind — it was one of those completely harmless kinds o

We carefully scraped the mold from the walls. It didn't mind — it was one of those completely harmless kinds of mold, nothing like some of the poisonous, acidic, or gods-know-what-else mold species you sometimes find. Beneath the mold, we found text carved into the wall, in distinct, clearly visible letters from some unknown language.