2 castles in this category.
Japan's first Western-style star-shaped fort, built in 1864 in Hakodate. Famous as the final battleground of the Boshin War and now a beloved cherry blossom viewing spot.
One of only two Western-style star-shaped forts (goryokaku) in Japan, built in 1867 in Saku, Nagano. Smaller than Hakodate's Goryokaku, it was built as the domain headquarters of the Sanada-affiliated Matsudaira clan.