Vasu Vihara, also known as the Somapura Mahavihara, is an ancient Buddhist monastery located in Paharpur, Naogaon District, Bangladesh. As one of the most impressive archaeological sites in the country, it was designated a UNESCO World Heritage site in 1985. Founded in the 8th century by the second king of the Pala dynasty, Dharmapala, it is considered one of the greatest monastic cities of the ancient world. The complex spans approximately 11 hectares, with a remarkable central pyramid-like stupa surrounded by a quadrangular courtyard composed of 177 cells where monks once resided. Though in ruins now, the site still exhibits a grandeur that echoes its historical significance. Intricate terracotta plaques, illustrating scenes from various Buddhist legends and the lives of renowned saints, adorn the walls of the stupa. Vasu Vihara played a crucial role in spreading the teachings of Buddhism across the region and was a renowned intellectual hub until the 12th century.