Batman Standing Guard DC Comics T-ShirtThis Batman t shirt shows the Dark Knight standing guard in front of Arkham Asylum. Arkham Asylum is located on the outskirts of Gotham City, and is where those of Batman's foes considered to be legally insane are incarcerated. Most of the staff and guards at Arkham Asylum are corrupt, and escapes are frequent. This leaves Batman to constantly battle the most dangerous villains in Gotham City, including the Joker, the Riddler, the Penguin, Poison Ivy,