The Needle

The Needle was an object one light-year long and fifty thousand kilometres in diameter, with one end affixed to a black hole.

History
The Needle had been Savar's TARDIS, but was caught by the black hole's gravitational pull and was stretched out when he tried to escape it.

Billions of years in the future, most of the people of the universe relocated to the Needle after a great disaster. (EDA: Father Time) One of the inhabitants of the Needle was Griffin. (EDA: Unnatural History)

Miranda Dawkins travelled to the future and became the Empress of the Needle. Many assassination attempts were made on her life by Prefect Ferran. Miranda eventually had a daughter called Zezanne on the Needle. (Miranda, EDA: Sometime Never...)

A few decades before the universe ended, the Needle was almost completely abandoned. The Doctor travelled there in search of Ohm. (PDA: The Infinity Doctors)