The European Organization for Nuclear Research, known as CERN, builds the largest tools on Earth to study the smallest constituents of matter: colliders and detectors. Its flagship is the Large Hadron Collider (LHC), a 27 km long collider. The Geodetic Metrology group at CERN provides metrology and alignment of components installed in the accelerators, their beam transfer lines and the physics experiments. It also performs R&D related to these tasks for upgrades of existing machines and for future accelerator. In this presentation, I will present the instrumentation and methods developed for the current accelerator complex and then introduce the new alignment systems under preparation for the LHC upgrade.