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.
Taj Mahal(India, Agra
https://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Taj_Mahal%2C_Agra%2C_India_edit3.jpg/550px-Taj_Mahal%2C_Agra%2C_India_edit3.jpg
It is said that it was made by the 20,000 craftsmen for 22 years.
A large dome is a cave in about 35 m.
The weight of a dome is 12,000 tons or more.
It was built in the time without a present heavy industrial machine.
How on earth was it built although there was much talk that people can make it if they spend many years.
http://slicer93.mbsrv.net/88-1040.html