The Wizard's castle

The Wizard's castle is a tall structure, located at the center of the Emerald City, where the "Wizard of Oz" was prophesied to appear as the castle's rightful ruler and guardian, and by extended to the vast Land of Oz. Originated from Frank L. Baum's fiction work, The Wonderful Wizard of Oz, and it's resulted film adaptations, the castle is also shown in the villain wars, usually controlled by the villain forces, particularly, the Wicked Witches of East and West.