The Burlington County Prison is a historic museum property, located next to the in Mount Holly Township, Burlington County, New Jersey, United States. Operating from 1811 to 1965, it was the oldest prison in the nation at the time of its closure. Designed by Robert Mills, its design exemplified period thinking in progressive prison design, with individual cells, good ventilation, and fireproof construction. Now operated by a local nonprofit as a museum, it was designated a National Historic Landmark in 1986.