The old jail, often referred to as a historic prison, is a building that once housed criminals and those awaiting trial. Many of these jails were built in the 19th century and feature thick stone walls, barred windows, and small cells. They serve as a reminder of the past justice system and the conditions prisoners faced. Today, many old jails have been preserved as museums, allowing visitors to learn about the history of crime and punishment. Some notable examples include the Eastern State Penitentiary in Philadelphia and the Old Jail in St. Augustine, Florida. These sites often offer guided tours and educational programs.