CERN

The European Organisation For Nuclear Research, known as CERN, was, according to the Twelfth Doctor, the largest particle physics laboratory on the planet. (TV: Extremis) It was located in Switzerland. (AUDIO: Lost Souls)

CERN housed the Large Hadron Collider, which allowed neutron eaters to escape into N-Space and kill humans. Torchwood Three, along with some CERN staff and UNIT's Martha Jones, managed to defeat the neutron eaters and save CERN. (AUDIO: Lost Souls)

Liz Shaw left UNIT to go work for the then-new organisation. (PROSE: Country of the Blind)

In a simulated world, several members of CERN chose to commit suicide after reading the Veritas and learning that they were no more than simulacra. (TV: Extremis)