"Explore Philly's Fairmount Park One of Philadelphia’s outdoor treasures, Fairmount Park is one of the nation's largest urban park systems. The park was originally founded in order to protect Philadelphia 's drinking water supply. The tract of land at Lemon Hill was the first land purchased to create Fairmount Park in 1855. Lemon Hill refers to both the house pictured and the hill itself, situated on a spectacular site overlooking the Schuylkill River, with views of the Art Museum and the city's skyline. The Lemon Hill mansion is one of several original park mansions still in existence. Each house has its own unique personality and history, and all are open to the public."