Arkham Asylum was shot in a real asylum in Lombardy, Italy.
With more than 3000 in-patients, Mombello has been one of the largest and most important psychiatric hospitals in Italy. It was visited from the second half of the 19th century by psychiatrists from all over the world: Germany, Romania, Spain, and Egypt. Different painters were welcomed in the Mombello hospital.
During World War I, Mombello's director was Giuseppe Antonini. At this time, two pavilions were equipped as military hospitals with care, research, and observation of troops from the front impacted by conflict-related psychological traumas. The "Veneto Pavillion" was built to host 250 war refugees.
The patients were divided by behavior and attitude in four different groups: "The Quiet Ones", "The Agitated Ones", "The Filthy Ones" and "The Workers". The patients of the second category were kept in isolation, while the other patients were usually used in alleged "therapeutic" work.
"The Quiet Ones" The Scarecrow, "The Agitated Ones" Two Face, "The Filthy Ones" Harley Quinn and "The Workers" The Riddler. Poison Ivy is the nature that took control of the Asylum.