This was how the Taj Mahal was protected from bomber jets in 1942 during world war.
It was covered with huge scaffold, to make it look like a stockpile of bamboo and misguide bombers.
I think the covering is still incomplete in this photo. It seems the whole of Taj Mahal was covered but this picture shows only the main dome covered. Maybe the govt didnt allow any photographers later to shoot the final scaffold cover.
During the India-Pakistan war in 1971, it was protected by covering it with a green cloth and making it almost invisible i.e camouflaged within the greenery around it.
Even in 2001, after the Sep 11 attack, Archaeological Survey of India took up the precautionary measure to cover it with cloth and it took them more than 20 days to do that!!
Isn’t it strange? You work hard and develop a beautiful asset. You get praises from everyone around the world. Later you work hard to safeguard this asset from getting destroyed by the same ppl who praised it. :)