structures in the world—from the 6th century, Hōryū-ji and Tōdai-ji's Daibutsuden, the largest wooden building in the world. The structures cover more than 1,000 years of Japanese Buddhist architecture, from the 6th century (Asuka period) to the 19th century (late Edo period). About three quarters of the designated properties are located in the Kansai region, with 60 National Treasure temple structures in Nara Prefecture and 31 in Kyoto Prefecture. The temple Hōryū-ji has the largest number of designated National Treasure buildings, with 18 structures. Miscellaneous structures There are four that do not fall into any of the other categories. They are the North Noh stage in Kyoto's Nishi Hongan-ji, the auditorium of the former Shizutani School in Bizen, the Roman Catholic Ōura Church in Nagasaki, and the Tamaudun royal mausoleum of the Ryukyu Kingdom in Shuri, Okinawa. The North Noh stage, dating to 1581, is the oldest extant structure of its kind, consisting of a stage, a , a , and a . Built during the mid-Edo period in 1701, the Auditorium of the Shizutani school, an educational institute for commoners, is a single-story building. It has a hip-and-gable (irimoya) tile roof composed of flat broad concave tiles and semi-cylindrical convex tiles that cover the seams. The structure is built of high-quality woods such as zelkova, cedar, and camphor. Ōura Church was established in 1864 by the French priest Bernard Petitjean of Fier to commemorate the 26 Christian martyrs executed by crucifixion on February 5, 1597, at Nagasaki. The façade of the church faces Nishizaka hill, the place of their execution. It is a gothic structure and the oldest extant wooden church in Japan. Built in 1501 by King Shō Shin, the Tamaudun consists of two stone-walled enclosures and three tomb compartments that in compliance with tradition temporarily held the remains of Ryūkyūan royalty. Ancient documents Valuable Japanese historical documents are designated in the category . There are 62 items or sets of items in this category, ranging from letters and diaries to records. One National Treasure is a linen map, and another is an inscription on stone. However, all other objects in the category were created with a writing brush on paper and in many cases present important examples of early calligraphy. The oldest item dates from the late 7th century and the most recent from the 19th century (late Edo period). Approximately half of the entries in the