Alcatraz, aka "The Rock", was first established as a military fort in the 1850s by the US Army. During the Civil War, it became a military prison and in 1934, a federal maximum security prison for high-risk civilian prisoners. Out of 36 inmates attempting to escape, none succeeded. In 1963, due to the inability to restore & maintain it, the prison was closed. San Francisco, CA.
The Alcázar of Segovia (literally, Segovia Castle) is a stone fortification, located in the old city of Segovia, Spain.The Alcázar was originally built as a fortress but has served as a royal palace, a state prison, a Royal Artillery College and a military academy since then. The castle is one of the inspirations for Walt Disney's Cinderella Castle.