Green Park, Westminster, London, 1826. View with figures strolling around the reservoir and a dog in the reservoir retrieving a stick. (Photo by Guildhall Library & Art Gallery/Heritage Images/Getty Images)

Green Park, Westminster, London, 1826. View with figures strolling around the reservoir and a dog in the reservoir retrieving a stick. (Photo by Guildhall Library & Art Gallery/Heritage Images/Getty Images)