I second the Tomb of Rassilon.
I think some space station corridors/rooms would be good, such as Space Station Nerva from the Ark in Space/Revenge of the Cybermen, or Sanctuary Base from the Impossible Plant/Satan Pit.
Otherwise, a Dalek base. The jungles of Spiridon, Zeta Minor, or Kembel, or the cave systems from Caves of Androzani.
