Projects were actively going on after the War to externally restore, by concrete, Tenshu designated as national treasures which had burned down in the Pacific War and, even today, there are movements to restore the ruins of castles including Tenshu by the building methods of those days.
太平洋戦争などで焼失した国宝の天守をコンクリート造りなどによって外観復元する事業が戦後活発に行われ、現在でも各地で、天守などを当時の工法によって城跡を旧状に復興・復元しようとする運動がある。