Gallifrey

Gallifrey is the home world of the Time Lords, from the Doctor Who continuum. Following the Last Great Time War, was believed destroyed, but has been relocated into a pocket universe due to the combined efforts of all thirteen incarnations of The Doctor. A lot of people are pretty upset about this, including the various Time Lord Agents.

According to one of the last surviving Time Lords, The Doctor, Gallifrey had a burnt-orange sky, lit by two suns. The local flora was red. The primary city was the Citadel of the Time Lords, beneath the mountains of Solitude and Serenity, silver and gleaming inside its bubble (presumably a force-field). It was occupied by a lot of people in funny robes. The rest of Gallifrey was apparently a BBC-standard disused quarry (just like the rest of the universe), except for the valley with the tower and random monsters, but no one remembers The Five Doctors any more.