Qutub Minar, the masterpiece of Indo-Muslim art, is made of red sandstone. It is included in the list of UNESCO World Heritage Site as per the criterion no (iv). According to this criterion, a building or architectural splendour which illustrates important stage(s) in human history can be included in the list. Qutub Minar, with its glorious past and related facts, occupies a significant place in the list of Indian monuments and conveys about a particular dynasty which was established by a mere slave.