Bangladesh - Ruins of the Buddhist Vihara at Paharpur

"Evidence of the rise of Mahayana Buddhism in Bengal from the 7th century onwards, Somapura Mahavira, or the Great Monastery, was a renowned intellectual centre until the 12th century. Its layout perfectly adapted to its religious function, this monastery-city represents a unique artistic achievement. With its simple, harmonious lines and its profusion of carved decoration, it influenced Buddhist architecture as far away as Cambodia." 
Source: UNESCO World Heritage