Which Mughal tomb in Agra is commonly called the “Baby Taj” because of its delicate marble latticework?

The Tomb of I'timād-ud-Daulah in Agra is commonly called the “Baby Taj” because of its delicate marble latticework.

Nur Jahan commissioned the tomb between 1622 and 1628 for her father, Mirza Ghiyas Beg, who held the title I'timād-ud-Daulah, meaning “Pillar of the State.” The building is faced largely in white marble and decorated with pietra dura, a technique using inlaid colored stones to form flowers and geometric designs.

Its nickname reflects visual similarities to the Taj Mahal, especially its white marble and garden setting, but it is not simply a smaller version of that monument. The tomb is especially important because it marks a transition in Mughal architecture from extensive red sandstone toward greater use of white marble and refined surface ornament.