The Castle of the Crystal is a gigantic castle that is the imperial capital in the alien world of Thra and a location in the 1982 Jim Henson fantasy movie The Dark Crystal. It was a beautiful place, made entirely of all crystal and once the home of the ancient urSkeks, until the crystal cracked and made a division into Skeksis and UrRu (Mystics); Then the evil Skeksis took control of the castle and made it there home, banishing any other living being who was not a Skeksis away from the castle turf.