Qutab Minar is a steep, 73 m-high tower of victory, built by Qutab-ud-din Aibak in 1193 immediately after the destruction of Delhi's last Hindu kingdom. The tower has five different levels, each extended by a projecting tapers and balcony from a 15 meter diameter at the base to just 2.5 meters at the top. The first three levels are made up of red sandstone; the fourth and fifth one level are of sandstone and marble. At the foot of the tower there is Quwwat-ul-Islam Mosque, the first mosque to be constructed in India. An inscription on its eastern gate informs that it was constructed with material obtained from destroying '27 Hindu temples'. A 7 m-high iron pillar stands in the area of the mosque. It is believed that if you can encircle it with your hands completely while standing with your back to it your desire will be fulfilled.