Tailed Beast Temple

Located on the Island Turtle behind the Falls of Truth is a temple with many structures, headless Bodhisattva-like sculptures (which B jokingly states were past jinchūriki that failed to open the door due to impure hearts, but later revealed were simply broken) and murals depicting the Eight-Tails and the Two-Tails on a giant wall. Inside the temple there are two chambers where the jinchūriki attempts to gain control over their tailed beast. The entrance to the first chamber where a jinchūriki attempts to control one's tailed beast has a sculpture of the Two-Tails' head with a switch inside its mouth, only accessible by entering head first. The chamber is designed to hold a tailed beast, in case the jinchūriki failed to master control and allow the beast to be reborn, and lock it up until a new jinchūriki comes forth. The second chamber is known as the Chakra Isolation Chamber, and is located behind the statue of the Eight-Tails' head. It's seemingly impossible to detect chakra inside or from out of the chamber, however Naruto while in his Nine-Tail Chakra Mode detected Kinkaku's six-tailed form, a feat that surprised the Eight-Tails.