The Philadelphia Aquarium was one of the first aquariums in the United States. It was located on the east bank of the Schuylkill River in Philadelphia’s decommissioned Fairmount Water Works buildings from 1911 to 1962, as part of Fairmount Park.

The Fairmount Water Works in Philadelphia, Pennsylvania, was Philadelphia's second municipal waterworks. Designed in 1812 by Frederick Graff and built between 1812 and 1872, it operated until 1909, winning praise for its design and becoming a popular tourist attraction. It now houses a restaurant and an interpretive center that explains the waterworks' purpose and local watershed history. It was designated a National Historic Landmark in 1976 for its architecture and its engineering innovations. It was the nation's first water supply to use paddle wheels to move water.