The Dalek Asylum
The Dalek Asylum housed millions of Daleks that had gone insane or malfunctioned from previous wars. The Asylum was fully automated so no supervision was required, the Dalek Parliament had no way of knowing what the battle damaged Daleks were up to.
The planet appeared cold and abandoned. A forcefield was put around the planet imprisoning the Daleks, the forcefield could only be controlled from inside the Asylum. The Alaska, a starliner crashed on the planet. The Daleks feared that if a ship could get through the forcefield then the Asylum Daleks may get out. The Parliament Daleks captured the Doctor, Rory and Amy and sent them to the planet to turn of the forcefield. The Parliament Dalek spaceship would then destroy the planet preventing any Daleks from escaping.