Qutub Minar is a UNESCO World Heritage Site and an attraction for many tourists. Qutub Minar of Delhi, The building process of Qutub Minar took a long time (about 75 years). It was started by Qutub-ud-din Aibak in 1192 and finished by Iltutmish. The minar was damaged andrepaired many times in past.This ancient Islamic Monument has about 379 stairs and is 237 ft tall. It has a diameter of 14.3 meters at bottom which decreases to 2.4 meters at the top. It is made of Red sandstone and has Arabic inscriptions on it.There are many stories about the naming of this tower. Some says that it was named after the first Turkic sultan Qutub-ud-din Aibak and some believes that it was named to honor Qutubuddin Bakhtiar Kaki, a saint.Many other ancient structures are there surrounding the Qutub Minar- Quwwat-ul-Islam Mosque, Iron Pillar. These monuments are collectively called Qutub complex.After an accident in 1981 (in which about 45 people were killed) climbing in tower was banned by government of India.