James Prinsep continued to take an Interest in architecture at Benares. Regaining his eyesight, he studied and illustrated temple architecture, designed the new mint building at Benares as well as a church. In 1822 he conducted a survey of Benares and produced an accurate map at the scale of 8 inches to a mile. This map was lithographed In England. He also painted a series of watercolours of monuments and festivities in Benares which were sent to London in 1829 and published between 1830 and 1834 as Senates Illustrated, in a Series of Drawings. He helped design an arched tunnel to drain stagnant lakes and improve the sanitation of the densely populated areas of Benares and built a stone bridge over the Karamansa over. He helped restore the minarets of Aurangzeb which were in a state of collapse. When he moved to Calcutta, he offered to help complete a canal that had been planned by his brother Thomas but left incomplete by the tatters death in 1830.