Pine Grove Furnace POW Interrogation Camp - Credit: Wikimedia Commons
The Pine Grove Furnace Prisoner of War Interrogation Camp was a secret World War II camp for interrogating German prisoners of war (POWs) located in a remote region in southern Pennsylvania, selected partly because of its proximity to Washington, DC. It operated from 1943 to 1945. Some ruins of the facility remain today. Read more on Wikipedia
Source: en.wikipedia.org