The Library

"The Library. So big it doesn't need a name, just a great big "The"."

- The Doctor.

The Library was a planet-sized library that was built during the 50th century. It contained every book ever written. Within its core was the largest hard drive ever, serving as an index computer. The planet has one moon, which is known as Doctor Moon.

The Library was commissioned by Felman Lux and was managed by a head librarian. Visitors to the Library used courtesy nodes: sculpted computer terminals containing real faces made from donated flesh. The security cameras were levitating wooden spheres. Visitors were advised to switch off their mobile comm units.

Paper editions of every book ever written were made specially for the Library. Unfortunately, the forests cut down to make the books were home to Vashta Nerada, which then hatched from the books and infested the library. The computer managed to "save" all 4022 visitors to its hard drive, where they could dream an imperfect virtual existence. The computer sealed off the planet, and it would be 100 years before the Lux family could arrange an archaeological expedition led by Professor River Song. (DW: Silence in the Library)