The Naka Shrine (南賀ノ神社, Naka no Jinja; Literally meaning "Shintō Shrine of Southern Joy") is a shrine in Konohagakure. In the main hall, beneath the seventh tatami mat from the far right, is a secret meeting place of the Uchiha clan. In there, is a tablet containing the clan's secrets and can only be read with specific dōjutsu. The Rinnegan is able to decipher more of the tablet than the Sharingan and the Mangekyō Sharingan are able to. Recorded there are the secrets of the Mangekyō Sharingan, the story of the Sage of the Six Paths and the Ten-Tails, as well as the secrets of Madara Uchiha's "body". In order to access the main hall, a sequence of seals is required to remove the stone that lays atop the entrance way. The seal itself has the Sharingan in the middle and is encircled with seal formulas.
The upper level of the shrine was destroyed during Pain's invasion, though the secrets hidden below remained untouched and was later accessed by Taka and Orochimaru during the Fourth Shinobi World War.