It was especially after World War II that Tenshu started to be actively constructed and, in many cases, those which had been burned down by air-raid, shown in old photographs or depicted in drawings or were only in legend were constructed in the reinforced concrete structure.
特に盛んに建てられ始めたのは第二次大戦後であり、空襲で焼失したものや古写真や絵図に描かれた天守、全くの伝説上の天守などが鉄筋コンクリート工法で建設されているものが多い。