The Bagmati River forms the northern boundary of Bihar, separating it from Nepal. It is a tributary of the Ganges River.

Rajendra Chola I, the great Chola emperor, extended his empire northward and conquered Patna during his military expeditions in the 11th century.

Sarnath (near Varanasi) is where Buddha delivered his first sermon after attaining enlightenment. Note: While Sarnath is technically in UP, it has strong historical connections to Bihar's Buddhist heritage.

The Grand Trunk Road (now NH-1) was built by Sher Shah Suri primarily to facilitate trade, communication, and movement of armies across the empire, connecting Delhi to Bengal.

Vaishali is prominently mentioned in Jain scriptures as the birthplace of Mahavira and an important center of Jain learning and culture.

Gol Ghar was constructed by the British in 1786 as a grain store. It is a distinctive hemispherical structure and an iconic landmark of Patna.

Nalanda district is historically significant as the location of the ancient Nalanda University and is associated with Emperor Ashoka's Buddhist heritage.

Dharmapal, a Pala dynasty ruler, established the Vikramashila University in the 8th century as a renowned center for Buddhist learning and philosophy.

Chandragupta Maurya, founder of the Mauryan Empire with capital at Pataliputra, conquered and united most of the Indian subcontinent around 322-298 BCE.

Ajatashatru caves are located in Rajgir, which is in Nalanda district. These caves are associated with early Buddhist monks and monastic life.