Nalanda University is one of the oldest universities in the world. It was built in 5th century AD by King Kumaragupta I. It is a UNESCO World Heritage site.
How to Reach ?
You can take a flight to Patna or Gaya directly. Trains are also available to Patna and Gaya station. From Gaya, Nalanda is around 95 kms and from Patna its around 85 kms; for which you can hire a cab or take a bus.
They charge 15Rs. entry ticket for Indians and 200Rs. for foreigner tourists.