It is a place where Night Ninja and his Ninjalinos train their martial arts. However, it is unknown where the exact location the temple is at. It is also the former location of The Rock of All Power.
Despite the Ancient Temple's whereabouts being currently unknown, people speculated that it is located in Mystery Mountain. This is proven to be false as it is stated to be far away from Tarabiscoville rather being located in another dimension and/or world.