On Friday, Bob went with his physics class to a town near Geneva, Switzerland to a laboratory called CERN. At CERN, is the world's largest particle physics lab. This includes the largest Hadron collider which is 100 meters underground. His class was given a private tour and Bob was blown away by the technology and the size of the lab.
The picture below depicts the track of the underground Hadron collider which is a ring that is 27 kilometers long!
* The above pictures were taken off the internet