- Quwwat-ul-Islam Mosque was constructed by Qutub-ud-din Aibak around 1197 AD in Delhi. Building material obtained from the destruction of other buildings was used for this new mosque.
- Qutub Minar of Mehrauli: Built around 1199 AD by Qutub-ud-din and finally completed by his son-in-law Iltutmish (1210-35 AD). Originally, the Minar had four storeys, uppermost of which was damaged by lightning in 1373. Firoz Shah Tughlaq (1351- 88) rebuilt its two storeys. This 72.5 m. high Minar with 399 steps, is the highest stone tower in India.
- Arahi din ka Jhonprah is an early mosque at Ajmer which was also constructed from the material obtained after demolishing Hindu temples. This one is also laid on the same plan as the Delhi Mosque constructed by Qutub-ud-din, with carved pillars used in colonnades.
Fig: Arahi din ka Jhonprah