In Norse mythology, Asgard was the home and citadel of the gods, corresponding to Mount Olympus in Greek mythology. It was located in the heavens and was accessible only over the rainbow bridge, Bifrost. Asgard had many gold and silver halls or palaces, the most splendid of which was VALHALLA, the residence of Odin. The Norse myths held that Asgard would be destroyed at RAGNAROK ("Twilight of the Gods"), the final battle in which the giants and demons would overcome the gods.