In Norse religion, Asgard (Old Norse: Ásgarðr; "Enclosure of the Æsir) is one of the Nine Worlds and home to the gods of the Æsir. It is surrounded by an incomplete wall attributed to a Hrimthurs riding the stallion Svaðilfari, according to Gylfaginning. Odin and his wife, Frigg, are the rulers of Asgard.
One of Asgard's well known locations is Valhalla, in which Odin rules.
For more information see Asgard on Wikipedia
On Nilfeheim Mount Asgard is the highest mountain on the planet located on the Island of Bifrost. On the side of the Mount Asgard is a cave called Cave of Extinct clans where the clan name is symbolically buried along with it's shields and flags when the last male of the line of the Clan Chiefs dies. In rare instances, a Clan Chief might chose to restore an extinct ancestral clan name by splitting what his two eldest sons would inherit and giving the second son the name of the extinct clan.