Close up shot of the entrance sign of the Archaeological Survey of India at the ruins of Nalanda Mahavihara an ancient Buddhist Monastic University in Bihar India

asi archaeological survey of india bihar sign nalanda monastic university tourist destination world heritage ruins spiritual religious faith burned india indian protection education historical structure past fire archaeological site damage tourist archaeology excavation restoration antique art archaeological buddhism carving famous sightseeing building exterior old buddha buddhist sculpture famous place heritage monastery temple mughal invasion tourism entrance flag post ruined unesco