Riyad Avlar spent 20 years languishing in Syria's jails, including a decade in the infamous Saydnaya prison, the scene of some of the Bashar al-Assad government's most brutal abuses.
Those long years behind bars have left him with one obsession: documenting and healing the atrocities committed inside the prison where he himself was locked up.
"I am sure we'll see Bashar al-Assad in court one day," predicted Avlar, who is Turkish.