"The capital of each raja or chieftain was a fort around which a township grew and developed; this pattern can be seen in many South Asian cities such as Delhi, Agra, Rajasthan, Lahore, Pune, Kolkata and Mumbai. Two forts in India are UNESCO World Heritage sites: the Agra Fort and the Red Fort. The oldest surviving fort in India is the Qila Mubarak at Bathinda which had it origins in 100 AD during the Kushan empire."@en . . .