Which world Heritage Monument has been acclaimed as the "Necropolis of the Mughal dynasty"?

Its architecture is credited to Mirza Ghiyath and its Mughal architectural style has been acclaimed as the "necropolis of the Mughal dynasty" for its double domed elevation provided with Chhatris. Apart from the tomb of Humayun, the funerary also has 150 tombs of various members of the royal family.