Old NewGate Prison - Connecticut
http://www.cultureandtourism.org/cct/cwp/view.asp?a=2127&q=302258
East Granby, CT
USA
Mining operations began at the Old New-Gate location in 1707. However, mining was not profitable, and in 1773 the Colony of Connecticut purchased the caverns and made them into a prison. It was used to house prisoners during the American Revolution, and in 1790 became the state prison. Old New-Gate was closed in 1827.