It would be unimaginable in Japan 14 centuries ago.
The first western style skyscraper was built in 1890 and demolished in 1923.
But Japan had pyramids long before that, there are speculations that the underwater pyramids of Yonaguni could be the remains of a civilization 5 thousands years old
>there are speculations that the underwater pyramids of Yonaguni could be the remains of a civilization 5 thousands years old
As far as I'm aware, the all but universal consensus among archaeologists and scholars (and the Japanese government) is that the "underwater pyramids" of Yonaguni are entirely natural.
The first western style skyscraper was built in 1890 and demolished in 1923.
But Japan had pyramids long before that, there are speculations that the underwater pyramids of Yonaguni could be the remains of a civilization 5 thousands years old