We know that the Taj Mahal is one of the seven wonders of the world. We know who built it and for whom. We know it is the pride of our nation, India. We know a lot about it. But we don't know a lot of things about it.

3. There is a small hole on the ceiling of the main hall perpendicularly above the tombstone of Mumtaz Mahal.

According to stories it is the work of an artisan who decided to sabotage Shah Jehan's dream of creating a masterpiece after he came to know about his decision to amputate all the artisan's arms. So the Taj is not as flawless as we would like to think it is.

4. The ASI had to conceal the Taj during WW-II with a huge scaffold to misguide bombers.

One of the most majestic man-made creations, the Taj was covered with a huge scaffold in the 20th Century so that it looked like a stockpile of bamboo to bombers. Then during the India-Pakistan war in 1971, and after 9/11, it was protected by camouflaging it with a green cloth.