The Bartow Pell Mansion Museum (BPMM) officially opened to the public as a museum in 1946. Glimpse into #19thcenturylife & #formalgardens through our programs. As the last remaining great country estate in the Bronx Pelham Bay Park, Bartow-Pell Mansion Museum explores the social history of the people who lived and worked on the estate during the 19th century.