If you loved Planet of the Vampires, try Hercules in the Haunted World
A bridge between a film you've already seen and one most people haven't. Hercules in the Haunted World has roughly 3.1× fewer votes than Planet of the Vampires — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Mario Bava, and they both carry the 3am cult, surreal mood tags, and they sit in Adventure / Horror territory. If that's the register that drew you to Planet of the Vampires, the second film will land in a comparable space — through a different lens.
What Hercules in the Haunted World is
Ecalia. Her dark sickness. A distant drum. Daianara lies senseless, cursed by a poison meant to secure a throne. Hercules descends to the land of the dead for a cure, unaware of the treachery that awaits his return. Bava’s low-budget color schemes achieve maximum dread.

