Place in a swamp or other ghastly venue to set the mood. This church has been repurposed as a base of operations to bring madness back into the world. Torture rooms and prison cells make great places to stick NPCs, entrances fit for traps, foggy stain glass to prevent people looking in from the outside but adds dynamic game play to bust in like Kool-aid. I tend to stick undead in the caskets and the poorly hidden room glows through the book shelf with the summoning of the supernatural.