The Mauryan capital of Pataliputra has been associated with the archaeological remains of

The archaeological remains of Pataliputra, the ancient Mauryan capital, are primarily associated with the sites of Kumrahar and Bulandibagh in modern-day Patna. Excavations at Kumrahar, conducted by archaeologists like D.B. Spooner and later the K.P. Jayaswal Research Institute, revealed a monumental 80-pillared hall believed to be part of the Mauryan royal palace or an assembly hall [3]. This site also yielded remains of a monastery-cum-hospital known as Arogya Vihar [3]. Bulandibagh is significant for the discovery of a massive wooden palisade, which served as the protective fortification wall of the ancient city as described by Megasthenes [2]. Excavations at Bulandibagh also unearthed punch-marked coins and Mauryan terracotta figures, including the famous 'smiling boy' [2]. Together, these two sites provide the most substantial physical evidence of the Mauryan empire's architectural and urban grandeur.

Sources

1. [1] http://maharajacollege.ac.in/fileupload/uploads/67a55c80be13120250207010608PG%20SEM-2_%20CC-7_PATALIPUTRA_PART-3.pdf
2. [3] https://tourism.bihar.gov.in/en/destinations/patna/kumrahar-puratav-park
3. [2] https://en.wikipedia.org/wiki/Bulandi_Bagh