Japan's 5 National Treasure Castles
Japan's Agency for Cultural Affairs designates certain objects and structures as Kokuhō (国宝) — National Treasures — the highest tier of cultural property protection in the country. For a castle to receive this classification, its main keep must be an original wooden structure of exceptional artistic merit, historical significance, and scholarly value. Of the twelve castles that still have original towers, only five have been elevated to National Treasure status: Himeji, Matsumoto, Inuyama, Matsue, and Hikone. These five are not merely "old castles" — they are considered masterworks of Japanese architecture that cannot be replaced at any cost.
National Treasure vs. Important Cultural Property
All twelve original castle towers hold at minimum the designation of "Important Cultural Property" (jūyō bunkazai). The five National Treasures represent a further selection within that group — those judged to be of the very highest value to Japan's cultural heritage. The distinction matters: National Treasures receive the strictest protections, the most rigorous maintenance standards, and the most significant government funding for preservation.