Elizabeth Arkham Asylum for the Criminally Insane (Earth-6531)

"Arkham Asylum is not just any institution for the criminally insane. It's the Ivy League of insanity. A "Harvard" for Psychopaths. Anything not described on the new inventory is contraband. Do not bring these items inside, no matter how small or commonplace they may appear. Bits and pieces do not fall through the cracks here. They fall into the hands of the best, the brightest and the sickest."

The Elizabeth Arkham Asylum for the Criminally Insane, commonly called Arkham Asylum or simply Arkham, was a psychiatric hospital dedicated to the rehabilitation of criminally insane individuals based on Gotham City. Conceived by Amadeus Arkham as a safehouse for his mentally ill mother, it eventually developed into a shelter for all those in need, becoming a nest for the insane criminals of Gotham, many which are foes to Batman.