Quwwat-ul-Islam mosque

Quwwat-ul-Islam Mosque (built 1192 - 1316) Quwwat-ul-Islam was sponsored by Qutb-ud-din Aibak, founder of the Mamluk dynasty. The Quwwat-ul-Islam is best known for its tower of victory, celebrating the Muslim conquest of India. It is the earliest extant mosque built by the Delhi Sultanate. It consists of a rectangular courtyard enclosed by cloisters. Perhaps it was the first monument of iconoclast in India. It is in contradiction to Hasan Nizami's account of Aibak as peaceful and 'Lakh Baksh' or 'giver of lakhs' in his book Taj-ul-Masir. It is said he was generous and spent huge sums in charity. But it may also be that the monument was hurriedly built with the building material from the temple as Aibak had not established himself firmly in India at that time.
 Quwwat-ul-Islam, the "Glory of Islam," was hastily erected by the young amir, who conscripted an army of local craftsmen, presumably Hindus, to assemble the structure. 
The Quwwat-ul-Islam is best known for its tower of victory, celebrating the Muslim conquest of India. It is built of red sandstone, gray quartz, and white marble, but is probably inspired by the “Iron Pillar " that stands on the site. Built in the Gupta dynasty in the 6th century, it is the only piece of the temple that stands in its original location. Qutb built around it when he constructed the mosque. Although made of iron, it has resisted rust for over 1,500 years, evidence of the Gupta's superb metallurgical skills.
Later, a lofty arched screen was erected and the mosque was enlarged, by Shams-ud- Din Iltutmish (A.D. 1210 - 1235) and Ala-ud-Din Khalji. The Iron Pillar in the courtyard bears an inscription in Sanskrit in Brahmi script of fourth century A.D., according to which the pillar was set up as a Vishnudhvaja (standard of god Vishnu) on the hill known as Vishnupada in memory of a mighty king named Chandra. A deep socket on the top of the ornate capital indicates that probably an image of Garuda was fixed into it.