One of the first instances of Mughal architecture in India, the minaret known as Qutb Minar, decorated with relief work and standing two hundred and forty feet (seventy-three meters) high, is erected near present New Delhi about 1230 to commemorate the military triumph of Qutb-ud-Din Aybak, founder of the Delhi Sultanate.

Made of fluted red sandstone covered with intricate carvings and verses from the Qur'an, construction was started in 1192 by Qutub-ud-din Aibak and is completed by Iltutmish.

Iltutmish also builds the Hauz-i-Shamsi reservoir in Delhi’s Mehrauli Disrtict.

Iltutmish builds Sultan Ghari, the first Islamic mausoleum in Delhi, for Prince Nasiru'd-Din Mahmud, his eldest son, in 1231.

The crypt or the tomb is implanted in a Ghari (cave), approached by winding steep stairs made of stone, and supported by pillars and flooring.

The cave is covered by an unusual octagonal roof slab.

The exterior of the tomb structure built in Delhi sandstone with marble adornment exhibits a walled area with bastions (towers) on corners, which impart it the look of a fortress in aesthetic Persian and Oriental architecture.