Bodhgaya (Bihar, India) – where the Buddha gained Enlightenment under the Bodhi Tree
Sarnath (in Uttar Pradesh, India) – where the Buddha gave the First Sermon
Vaishali (in Bihar) – where the Buddha gave His last sermon
Kushinagar (in Uttar Pradesh, India) – where the Buddha entered Parinirvana
Sravasti (in Uttar Pradesh) – where the Buddha spent most of His life during rainy seasons at the Jetavan monastery (built by Anathapindika)
Rajgir (in Bihar) – site where the Buddha gave many important sermons
Nalanda (in Bihar) – location of famous Buddhist university in medieval times
a. Lumbini (in Nepal)
b. Bodhgaya (in Bihar, India)
c. Sarnath (in Uttar Pradesh, India)
d. Vaishali (in Bihar, India)
e. Kushinagar (in Uttar Pradesh, India)
f. Rajgir (in Bihar, India)
g. Nalanda (in Bihar, India)
More about ancient universities.
There are three ancient universities
1. Vikramashila university (in Bhagalpur, Bihar)
2. Nalanda university (in Nalanda, Bihar)
3. Taskhshila University (now in Texila-Rawalpindi, Pakistan )