Sher Shah Sur the great Indian ruler India 1540 AD -1545 who was born in a small town of Bihar called Sasaram. This 16th century ruler of the Indian sub-continent, is credited with many new ideas, innovation and pragmatic vision, He constructed the famous Grant Trunk Road, present day G.T Road, which literally bound India together for centuries, providing a vital link for trade and communication across the empire. During a small period of his rule, he has constructed many architectural monuments including forts, Sarais, Mosques and tombs. The Tomb of his father Hasan Khan Sur, the Jagirdar of than Chainpur Pargana of Bihar, and his own tomb is finest example of Turko-Indian Art and Architecture. The article deals with the architecture characteristic of the monument and also discuss that how the idea of constructing the monuments inside of artificial lake came into exist. The tombs built by Sher Shah Sur in Sasaram evoke a sense of grandeur. The octagonal tombs at Sasaram are the more elaborate versions of the octagonal type of tomb developed in the Sayyid and Lodi period. The largeness of the conception of Sher Shah’s resting place clearly reinforces that the unquestioned popularity he enjoyed in his time in north India.