Kumhrar, in the southern part of Patna, is the archaeological site where the ancient city of Pataliputra has been excavated. Pataliputra was the capital of the Maurya and Gupta empires -- the city of Ashoka, Chandragupta, and the philosopher Chanakya -- and one of the largest cities in the ancient world, with a population estimated at 400,000 around 300 BCE.
The visible remains are modest: a few of the eighty original sandstone columns of Ashoka's audience hall, fragments of wooden palisades, and foundations of Mauryan buildings. There is a small site museum. For most visitors the site is more about imagination than spectacle -- but standing among the column stumps you are at the centre of one of the great vanished cities.