Okinawa Prefecture also has the fewest number of shrines per 100,000 people, with 0.9 shrines per 100,000 people; Osaka (8.22) and Tokyo (10.68) are in second and third place, respectively.
The hall of worship is the place where rituals and worship services are held, and in some cases also serves as a dance hall, kaguraden, and shrine office. Some shrines, including Ise Jingu, do not have a hall of worship.
The custom of worship at Izumo-taisha is "Ni-hai (two worships, four claps, one bow, and one bow). In addition, during the annual festival in May, the worshippers bow with eight beats of the hand.
There are various theories as to the origin of the torii, such as that the perch of a bird was placed in front of the shrine in reference to the "everlasting long-nesting bird" that appeared in the Kojiki (Records of Ancient Matters) to lure Amaterasu out of Ama-no-Omikami (Amaterasu) from the Ama-no-Iwato.
Sumiyoshi Taisha Shrine in Osaka Prefecture is the head shrine of the 2,000 Sumiyoshi shrines in Japan. The three Sumiyoshi deities were worshipped as gods of navigation and purification.
The oldest shrine in Japan is said to be the Ogami Shrine in Sakurai City, Nara Prefecture. Because Mt. Miwa itself is the deity, there is no temple, and only a hall of worship has been erected.