Apartment 50 at 10 Bolshaya Sadovaya — the "bad apartment" of The Master and Margarita, where Woland's retinue takes up residence. Bulgakov lived here in the early 1920s, and the stairwell had its reputation before the novel: residents said people went missing from that flat. After the book was published the entrance stood covered in quotations and drawings for decades — the walls were painted over, the writing came back. There is a museum there now, but the habit of leaving a note for Woland has not gone anywhere, and locals describe the black cat in the courtyard in a tone that is not entirely joking.