alai minar in qutub minar complex

1200ce 1220 aibak alai ancient architectural architecture brick building calligraphy column complex culture damaged delhi design firoz heritage historic history iltutmish india kutub landmark marble mehrauli minar minaret monumentintricate mughal muslim ornate pillar qutb qutub qutubuddin religion remains ruins sandstone second shah site stone sultanate tall tallest tomb tourism tower tughlaq unesco watch world