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Completely resonate with your point.
I think they had lot of Man Power and dint think about spending loads of cash on making such structures.
Today, It doesn't become economically feasible spend crores n crores on Monuments and Statues.

Absolutely! Army of man power at the disposal of the Maharaja. Maharaja had the sole power and wasn't answerable to anyone.

Nowadays, its a different scenario, very few countries build iconic structures which can go on to become monuments for the future generation. The U.A.E is one country, who is numero uno currently in building upcoming monuments.