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
Thursday morning's weather for the east of the region
Thursday morning's weather for the west of the region
Wednesday evening's Pollen Forecast