Phantom of the Opera (1943)
A lesser-known production by Universal (at least relative to Dracula, Creature from the Black Lagoon, Frankenstein, and other heavy-hitters) but still disturbing and terrifying, in part because it is realistic. A disgruntled composer flees to the sewers beneath the Paris opera house and stalks a young woman. I will now forever pass a manhole cover and wonder, perhaps...?