Like Download 1.31 MB metal staircase in Alcatraz 1820 x 2730 pixels Aspect ratio 2:3 Canon PowerShot SX710 HS 32.42 mm f/5.6 1/20 s ISO 1000 Online since: 5 October 2019 Taken: 22 July 2015 CC0 / Public Domain staircase spiral staircase spiral metal alcatraz san francisco prison bars design