The central focus of the complex is the tomb. This large, white marble structure stands on a square plinth and consists of a symmetrical building with an iwan (an arch-shaped doorway) topped by a large dome and finial. Like most Mughal tombs, basic elements are Persian in origin.
The base of the Taj is a large, multi-chambered structure
The base structure is essentially a large, multi-chambered cube with chamfered corners, forming an unequal octagon that is approximately 55 meters on each of the four long sides. On each of these sides, a massive pishtaq, or vaulted archway, frames the iwan with two similarly shaped, arched balconies stacked on either side. This motif of stacked pishtaqs is replicated on the chamfered corner areas, making the design completely symmetrical on all sides of the building. Four minarets frame the tomb, one at each corner of the plinth facing the chamfered corners. The main chamber houses the false sarcophagi of Mumtaz Mahal and Shah Jahan; the actual graves are at a lower level.