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15世紀のインカ帝国が築いた巨大石壁「サクサイワマン」。 一部は重さ200トンを超える石を、モルタルなしでジグソーパズルのように隙間なく組み合わせ、 カミソリの刃すら通さない精度を実現。 500年以上経った今も地震に耐える強度を保ち、建築技術は ...
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