Great Zimbabwe（Zimbabwe）
By Takashi
This page which is based on the information from 'THE UNIVERSE(THE SKY)=SORA' is made by HONO who is one of the fellows of THE UNIVERSE(THE SKY)=SORA.
Great Zimbabwe（Zimbabwe）
Reference
https://ja.wikipedia.org/wiki/%E3%82%B0%E3%83%AC%E3%83%BC%E3%83%88%E3%83%BB%E3%82%B8%E3%83%B3%E3%83%90%E3%83%96%E3%82%A8%E9%81%BA%E8%B7%A1
https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Great-Zimbabwe-2.jpg/550px-Great-Zimbabwe-2.jpg
Although it was made of natural stone and adobe brick, both do not adhere with mortar.
Although a rock and a block are not combined with mortar, both have joined here together firmly.
In addition, the castles which are bonded with the rock and the block are Edinburgh, the Kalak castle, etc.
Reference
http://www.cosmos.zaq.jp/t_rex/fusigi_2/works_2/works_14_2_q.html
http://www.geo.tsukuba.ac.jp/gansekiHP/image/z99/z3-4.jpg
http://www.geo.tsukuba.ac.jp/gansekiHP/image/z99/z3-4.jpg
http://slicer93.mbsrv.net/88-1027.html