Tomb of Ghias -ud -din Tughlaq is a family mausoleum which was made up of stone edifice decorated with choice marbles. Located on the southern part of the Tughlaqabad Fort, this structure monument stood at the centre of a large reservoir which used to be filled with water. While the Sultan of Delhi, Ghias- ud- din Tughlaq decided to fortify every corner of his territory in order to save it from external attacks, he included his fort as well. This monument which is located across the Bardarpur border reflects one of simplest form of architecture which existed during the period of Delhi Sultanate
. Though the reservoir is no more filled with water and the bridge between the tomb and the fort is broken for building highways, yet this monument is regarded as one of the significant historical models of Delhi.
Tomb of Ghias -ud -din Tughlaq is a very simple structure which is mainly designed as a warrior`s tomb. The tomb is made up of sloping red sandstone which has arch shaped gateway decorated with beautiful latticework with white marble. The tomb is mainly white in colour decorated with some inscription from the Holy Quran
including some panels which are decorated as borders on the walls of the tomb. It contains some lattice screens and `lotus-bud` edge which decorates the monument. Towards the left of the entrance in the corridor there is a tiny grave which is said to be Sultan` s favourite dog which is different from the usual conventions of the Muslim tombs.
Tomb of Ghias -ud -din Tughlaq unlike other tombs is a family tomb which includes the grave of sultan`s wife Makh Dumai Jaan and his second son Mahmud Khan who died withy him unde the pavilion. Near the northern side of the tomb there is another tomb which is octagonal in shape and carries an inscription which states that there lies the grave of Zafar Khan. However the identity of Zafar Khan is not known but it holds a lot of significance as this was the first tomb which was initially located in that area and gave Ghias- ud -din, the idea of constructing tombs in this part of the fort.
Thus the tomb of Ghias-ud- din Tughlaq has been one of the significant monuments of Delhi which describes not only the excellent architecture of Tughlaqabad but also Adilabad forts which carry the origin of Delhi Sultanate.