Murder Castle
I just realized I could have called this the "Heartbreak Hotel" for the same morbid giggle. Anyway! This lovely three-story inn is based off the real-life hotel from which it gets its name, and steals the same morbid secret: the owner has a murderous predilection! Secret passages and doors allow easy access to any room in the hotel, and ladders and trapdoors allow access to a gruesome abattoir in the basement.
Which is a shame, because otherwise it's a rather delightful little hotel. Well-furnished, handsome architecture, and the penthouses have dedicated bathrooms. FANCY.