Kumar, who visited historical sites at Bhurha and Dubbha during his 'sewa yatra', ordered excavation at Dubbha and establishing of a museum to house antiques.
The Chief Minister visited Mahabodhi temple at Bodh Gaya earlier in the day and offered prayers.
As part of efforts to promote Buddhism, the Bihar government had co-hosted an international Buddhist Sangha Conference in Patna. The meet had been inaugurated by the Dalai Lama.