Additionally, since some castle towers (including those of Edo-jo Castle and Osaka-jo Castle) that had been burnt down or destroyed by disasters and the like during the Edo Period were not subsequently rebuilt, the number of castle towers fell.
また、江戸時代を通じて災害などによる焼失や倒壊によって、その後は再建されなかった天守もあったため（江戸城、大坂城など）、その数は減少の一途であった。