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.
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