The Qutb Minar is the tallest brick minaret in the world, inspired by the Minaret of Jam in Afghanistan, it is an important example of early Afghan architecture, which later evolved into Indo-Islamic Architecture. The Qutb Minar is 72.5 metres (239 ft) high, has five distinct storeys, each marked by a projecting balcony carried on muqarnas corbel and tapers from a diameter 14.3 metres at the base to 2.7 metres at the top, which is 379 steps away. It is listed as a UNESCO World Heritage Site along with surrounding buildings and monuments.