The Nightmare Castle is a dreaded mountainous palace that is the lair of the Nightmare King and a location featured in the 1989 animated adventure fantasy movie Little Nemo: Adventures in Slumberland based on the 1905 comic strip Little Nemo in Slumberland.


Nightmare Castle is a huge mountain surrounded by large sharp pointed rocks. It is the middle of the sea. It has a force field at the entrance, the only to get in is to go under it. There a prison chamber where the Nightmare King keeps his prisoners in giant reliquaries.




  • The Nightmare Castle originally made an appearance as a giant icy pillar-like castle
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