Castle in the Sky Mod (1.19.2, 1.18.2) introduces a new structure to the game that only exists up in the vast sky. It rarely spawns so only a few travelers will see it during their commutes. The only way to enter the castle is by using an elytra (a bridge that was built solely for the purpose of heading up). Players will be amazed at the intricate architectures once inside. Hidden treasures are waiting for players who look closely enough. It is a safe haven for all evil entities to not enter the castle.