It's an experience most of us try to avoid, but hundreds of people have taken up the rare opportunity to get a taste of life behind bars.
They were on a series of guided tours around Kingston Prison in Portsmouth which closed earlier this year. What impression did they get of what it would have been like for the inmates? Richard Jones was there to find out.
More top news
Helen Plint has the forecast for tonight and tomorrow in the west of the region.
Helen Plint has the forecast for tonight and tomorrow in the east of the ITV Meridian region.
Six springer spaniels nursed back to health after being abandoned near Ashford