Change of guard at Missouri state penitentiary. Jefferson City, Missouri. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282820/photo-image-person-sky-public-domainFree Image from public domain licenseOne of many similar signs strung along the fence enclosing San Quentin penitentiary grounds. Sourced from the Library of… https://www.rawpixel.com/image/12297257/photo-image-plant-grass-skyFree Image from public domain licenseState penitentiary. Jefferson City, Missouri. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282643/photo-image-plant-person-skyFree Image from public domain license