Taj Mahal was covered with a huge scaffold during World War 2 to make it look like a stockpile of Bamboo and misguide any enemy bombers. (It was also disguised again in 1971!)

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!!

at 09:21