Gwalior Fort
Gwalior Fort in the state of Madhya Pradesh, stands on an isolated rock, overlooking the Gwalior town, and contains a number of historic buildings. It is one of the biggest forts in India. he fortress and the city have been integral to the history of the kingdoms of North India. It is said that the Mughal Emperor Babur (1483–1531) described it as, “The pearl in the necklace of the forts of Hind”.
Gwalior Fort also occupies a unique place in the human civilization as the place which has the first recorded use of zero ever. In 1023 AD Mahmud of Ghazni attacked to capture the fort but was repulsed. In 1196 AD, after a long siege, Qutubuddin Aibak. the first Sultan of India took over the fort but he lost it in 1211 AD. It was reconquered in 1231 AD by Sultan Iltumish, the slave dynasty ruler of Delhi. When Timurlane invaded Delhi and created anarchy in the region, Narasingh Rao, a Hindu chieftain captured the fort. The fort eventually went Sikander Khan who continued for some time.
