Arkham Asylum is a LEGO Batman set which was released in 2006.
Do you dare enter Arkham Asylum? The worst criminals in Gotham City are imprisoned behind the gloomy walls of Arkham Asylum. The Scarecrow, the master of fear; The Riddler, the prince of puzzles; Poison Ivy, beautiful and deadly queen of the plant kingdom -- all have been sent to Arkham by the Batman. Now they threaten to escape, and only the Dark Knight and Nightwing can stop them! Includes a guard tower, asylum van, cells for the criminals, a bed sheet 'rope' for escapes, Nightwing's cycle and much more! Includes Batman, Nightwing, The Riddler, The Scarecrow, Poison Ivy, and two Arkham Asylum guard minifigures.