Qutb Minar

This is the tallest stone tower in India built from AD 1192 – 1210 as a tower of victory attached to the Quwat-ul-islan Mosque.  It was damaged by lightning in 1326 and in 1368 and the forth story was rebuilt in 1351-88 and an additional storey added, making it a five storey structure.  With a height of 238 feet and 379 steps and the highest tower in India, it is 5 feet less in height than the Taj Mahel (243 feet).

More information off the Internet

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 beginning of Muslim rule in India. 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 laterSultan 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