Some existing castle towers (including that of Himeji-jo Castle and Hikone-jo Castle) have gone through repeated renovations to maintain their near-original splendors, whereas other ones (including that of Inuyama-jo Castle, Matsumoto-jo Castle, Kochi-jo Castle, Maruoka-jo Castle, and Matsue-jo Castle) that were rebuilt while their respective castles existed have remained virtually intact through today.
修復などを繰り返しほぼ創建当時のままを維持してきたもの（姫路城・彦根城）、または、現存天守が在籍していた城が存城であった当時に再建、改築されたものがほぼそのまま残っているもの（犬山城・松本城・高知城・丸岡城・松江城など）もある。