Crucible

Previously touched upon in the finale for Season 3 of the Revived Doctor Who (by the master- "I was there when the Daleks took control of the Crucible"), the Crucible is a space station roughly the size of a planet. It is likely that it was created by the Daleks and/or Davros. It has a metallic outer shell but a rocky, sandy interior suggesting that the Daleks modified an alreday existing planet. Human prisoners were taken for an unknown variety of testing during the Dalek invasion of Earth in 2009. (DW: Journey's End)

The Crucible may also be the station made for the Shadow Proclamation.