Considered to be the oldest university on earth, nalanda university in modern day bihar, drew scholars from all over asia, surviving for hundreds of years before being destroyed by an army led by bakhtiyar khilji. the institution was established during the gupta emperors in 450 ad. at its peak, it had 10,000 students, 2,000 staff, numerous compounds, dormitories for students, temples, meditation halls, and almost every other possible educational infrastructure. the library alone is believed to have had a collection of around 9 million volumes. today, this much-celebrated centre of buddhist learning is in ruins.