Had it been still there, we would have learnt so much about ancient knowledge.. also amazed to know how big it was at those times. When Afghan invader burnt it,

Had it been still there, we would have learnt so much about ancient knowledge.. also amazed to know how big it was at those times. When Afghan invader burnt it, it took 3 months >> The campus was so vast that the fire set on by the attackersis said to have burned for three months.