Nandana

Nandana or Nandna was a fort built at strategic location on a hilly range on the eastern flanks of the Salt Range in Punjab Pakistan. Its ruins, including those of a town and a temple, are present. It was ruled by the Hindu Shahi kings until, in the early 11th century, Mahmud of Ghazni expelled them from Nandana. Al-Biruni carried out his measurements of the circumference of the Earth here.

• http://en.wikipedia.org/wiki/Nandana