Arkham Asylum

From the Lego Batman Wiki

Arkham Asylum is home to many of Gotham City's criminally insane. Many villains such as the Scarecrow have stayed here at one point or another. It's also used as the HUB for the villians in Lego Batman: The Video Game.In the game the Penguin and Killer Croc rescued Catwoman from the prison to get the diamond she stole.At the start of the game,all the villains break out of Arkham Asylum and join seperate gangs,each leaded by a famous Batman villain.The Character Customiser is also located here.