[Multiple photos] Impenetrable: The secret of the United States superprison

It is no exaggeration to say that as many Americans are in prison as Chinese are not. But it is a fact that there are more prisons in the United States, and the United States has been named a prison country, and prisons have become a scene in the United States. The State Department's White Paper on the State of Human Rights in the United States is very detailed, but it is still difficult to get a first-hand look at American prisons, especially those "supermax" prisons.