Fermilab particle accelerators. Aerial view of the Fermi National Accelerator Laboratory (Fermilab), outside Chicago, USA. The figure-of- eight configuration of Fermilab's two main accelerators is clearly shown. The Main Injector accelerator is seen at centre right, the Tevatron accelerator at upper center. The accelerators are buried underground, but the service roads and cooling ponds marking their location are clearly seen. At centre left are the laboratory's administration buildings.