https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/6074651
Tatsumi-yagura, Tokyo Imperial Palace.
The tatsumi-yagura is a two-story high keep at the easternmost corner of the Sannomaru and the only keep still remaining in it. Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use