Qutb Minar
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.
Built as a Victory Tower, to celebrate the victory of Mohammed Ghori over the Rajput king, Prithviraj Chauhan, in 1192 AD, by his then viceroy, Qutbuddin Aibak, later the first Sultan of Mamluk dynasty. Its construction also marked the end last of Hindu kingdoms in North India, and the beginning of Muslim rule in India, which ended only in the 19th century with the arrival of the British, and even today the Qutb remains one of the most important "Towers of Victory" in the Islamic world. Aibak however, could only build the first storey, for this reason the lower storey is replete with eulogies to Mohammed Ghori. The next three floors were added by his son-in-law and successor, Iltutmish. The minar was first struck by lightning in 1368 AD, which knocked off its top storey, after that it was replaced by the existing two floors by Firoz Shah Tughlaq, a later Sultan of Delhi 1351 to 1388, and faced with white marble and sandstone enhancing the distinctive variegated look of the minar, as seen in lower three storeys. Thus the structure displays a marked variation in architectural styles from Aibak to that of Tughlaq dynasty.
The minar made with numerous superimposed flanged and cylindrical shafts in the interior, and fluted columns on the exterior, which have a 40 cm thick veneer of red and buff coloured sandstone; all surrounded by bands of intricate carving in Kufic style of Islamic calligraphy, giving the minar the appearance of bundled reeds. It stands just outside the Quwwatul mosque, and an Arabic inscription suggests that it might have been built to serve as a place for the muezzin, to call the faithfuls for namaz. Also marking a progression in era, is the appearance of inscriptions in a bold and cursive Thuluth script of calligraphy on the Qutb Minar, distinguished by strokes that thicken on the top, as compared to Kufic in earlier part of the construction.
Inscriptions also indicate further repairs by Sultan Sikander Lodi in 1503, when it was struck by lightning once again. In 1802, the cupola on the top was thrown down and the whole pillar was damaged by an earthquake. It was repaired by Major R. Smith of the Royal Engineers who restored the Qutub Minar in 1223 replacing the cupola with a Bengali-style chhatri which was later removed by Governor General, Lord Hardinge in 1848, as it looked out of place, and now stands in the outer lawns of the complex, popularly known as Smith's Folly.
After an accident involving school children, entry to the Qutub Minar is closed to public since 1981, while Qutub archaeological area remains open for public. In 2004, Seismic monitors were installed on the minar, which revealed in 2005 Delhi earthquake, no damage or substantial record of shakes. The reason for this has been cited as the use of lime mortar and rubble masonry which absorbs the tremors; it is also built on rocky soil, which further protects it during earthquakes.
Read more about this topic: Qutb Complex