What Arkham Asylum is
Dennis O’Neil and Irv Novick introduced Arkham Asylum in Batman #258 (October 1974). The name draws on H.P. Lovecraft’s fictional Arkham, Massachusetts; O’Neil’s framing positioned the asylum with deliberately Lovecraftian gothic-horror register. The asylum has been the recurring confinement location for Batman’s rogues’ gallery across fifty years of publication.
Grant Morrison and Dave McKean’s 1989 graphic novel Arkham Asylum: A Serious House on Serious Earth is one of the most-cited Bat-rogue stories ever published. The Rocksteady Arkham video game trilogy (2009-2015) extensively adapted the location and made it one of the most-recognized Batman settings in any medium.
Collector context
Batman #258 trades modestly. Arkham Asylum: A Serious House on Serious Earth (the graphic novel) trades higher and is one of the most-collected Batman graphic novels.