The Qutub Minar is made of red sandstone covered with intricate carvings and verses from the Qur'an. It is built by Qutub-ud-din Aibak. Numerous inscriptions in Parso-Arabic and Nagari characters in different sections of the Qutub Minar reveal the history of its construction. According to the inscriptions on its surface it was repaired by Firoz Shah Tughlaq (AD 1351ââ¬â88) and Sikandar Lodi[7] (AD 1489ââ¬â1517).