Bheja fry question

 This is the question I came across when I was listening to Web radio.

This question though sounds simple, but it is not. 

It was the time when Akbar was ruling Agra. That time a severe flood 

happened in Agra. Whole city got inundated. But nothing happened to 

Tajmahal. How?

After listening to the question, I started thinking about what could be the reason

 for this? I thought maybe Tajmahal was constructed on a high altitude area and

 that's why it didn't get submerged. 

But actual reason is different. 

When Akbar was ruling, Tajmahal was not built.

Tajmahal was built by Shahjahan, who is the grandson of Akbar!!!!