Farpoint Station, as it was first seen..
It was actually a spaceborne entity enslaved by the Bandi.
Initially thought to be a large spaceport on Deneb IV, the station was actually a giant, shape-shifting lifeform, forced to assume the form of the base by the natives of Deneb IV, the Bandi.
Thanks to the intervention of the U.S.S. Enterprise-D, the creature was able to return to space.
TNG: "Encounter at Farpoint" The series premier. Also introduced Q.
Wow, you're my hero, I'm being serious, did you program all that from memory 
lol, I am impreseed.