Ghiyath-ud-Din's self-built tomb, with a mausoleum enclosed
within high battered pentagonal stone walls, strengthened with bastions,
looks like a small fortress. Originally, it stood within a vast reservoir
and was connected with the fortress of Tughluqabad by a causeway, which
has been pierced now by the Qutub-Badarpur road.
An Exquisite Blend Of Marble & Red Sandstone
The entrance to the tomb enclosure is through a high and massive gateway of red sandstone, approached by a flight of steps. The mausoleum, about 8m-sq, with sloping walls of red sandstone crowned with battlements is surmounted by a white marble dome raised on an octagonal drum.
A string-course, inscribed panels, arch borders and perforated screens in tympana - all in marble - together with its 'lotus-bud' fringes break the monotony of the red sandstone and lend it a decorative effect. There are three graves inside, the central one of Ghiyath-ud-Din Tughluq and the other two believed to be those of his wife and his son and successor, Muhammad Bin Tughluq.
Against the enclosure-walls are cells or pillared corridors with bracket-and-lintel openings. In the north-western bastion there is an octagonal tomb with an inscribed slab over its southern door, according to which Zafar Khan lies buried in it. It seems that this tomb was the first to be raised here and while engaged on its construction, Ghiyath-ud-Din had the idea of putting up an enclosure and siting his own tomb also inside it.
The place is referred to as "Daru'l-Aman" (abode of peace) in the inscription mentioned above and also in the contemporary accounts of Ghiyath-ud-Din's tomb.