[€uroMeinke]

One of the pleasures I've had in my job is occasionally visiting abandoned or repurposed buildings - some as much as a century old, and quite industrial for the time - they may sport their own stables, black smith shops, etc. And some housed some huge machinary, that when removed left underground passages, trap doors to unusual places, stairs and doorways leading nowhere, or rooms sealed from any normal entrance. Often these places had stories of hauntings, doors opening and closing on their own and the like.