Interior view down a corridor at Sing Sing Prison at Ossining, New York. On the right are what appear to be jail cell doors. In the center, a walkway passes in front of the cell doors for the length of the corridor. A rail on the left side of the walkway protects from a drop to a lower level. Halfway up the corridor on the second floor, a small, glassed-in room has steep steps leading down to the lower floor.