The House of a Thousand Mirrors was the palace of the wizard Tuzun Thune on the shore of the Lake of Visions in Valusia. Inside the palace was a great chamber with walls and ceiling made entirely of mirrors. These magical mirrors were used by Tuzun Thune to imprison the souls of those who gazed into them, as he tried to do against Kull. When Brule learned of his plan, he saved Kull at the last minute and killed Tuzun, leaving his body to rot inside the palace which was avoided by everyone thereafter.