Arkham Asylum

Arkham Asylum is a psychiatric hospitol located near Gotham City, it's patients and residents include some of the most dangerous psychotic criminals; including The Joker, who among others imprisioned have escaped numerous time.

While Arkham is a mental institute, it often serves as a jailhouse; just to house more sane criminals, some of the more dangerous of which includes, Bane.

Inmates

 * The Joker
 * Harley Quinn
 * Penguin
 * Killer Croc
 * Two Face
 * Clayface
 * Poison Ivy
 * The Riddler
 * Bane
 * Black Mask
 * Victor Zzaz
 * The Mad Hatter (Jervis Tech; not to be confused for the actually character)
 * Scarecrow
 * Clock King
 * Venquilitrist
 * Professor Pyg