English: The Qutub Minar was constructed with red sandstone and marble, and is the tallest minaret in India, with a height of 72.5 metres (237.8 ft), contains 379 stairs to reach the top,[citation needed] and the diameter of base is 14.3 metres whereas the last storey is of 2.7 metres. The Construction was commenced by qutub-ud-din Aibak in 1192 and completed by Iltutmish.