Vasu Bihar — locally also called Narapatir Dhap — is a group of low mounds that hid Buddhist buildings. Excavations by the Department of Archaeology in the 1970s uncovered two monasteries built around courtyards of monks’ cells and a cruciform temple, along with terracotta plaques, bronze images and other finds.
Many scholars identify the site with Po-shi-po, a monastery near the capital of Pundravardhana that the Chinese pilgrim Xuanzang described in the 7th century, with hundreds of monks studying there. If so, it was a place of learning in the same world as Mahasthangarh and, further west, Paharpur.
What survives today are brick foundations and walls standing a little above the ground, among fields and trees. It is far quieter than Mahasthan, and you can trace the plan of the cells and courtyards on foot.