Army Of Ghosts Playground
This is where the TARDIS landed in Boom Town, opening the rift towards the end of the episode.
The Doctor returned in Utopia.
This is also the site of Torchwood One’s secret underground base, The Hub.
Millennium CentreOpposite the Torchwood tower is the Cardiff Millennium Centre, which has appeared a number of times in the new series.
The interior was seen in Boom Town, New Earth, Utopia, Last Of The Time Lords, and with some matt shot trickery in Vincent And The Doctor.
Ianto Memorial WallDown by the dock, obscuring the entrance to Torchwood One, is the Ianto Jones Memorial wall.
Only a moment though.