Click on the member states of CERN, the European Organisation for Nuclear Research, the largest particle physics labratory in the world, located on the Franco-Swiss border.
Blue- founding members of CERN
Green- members of CERN who joined later
Image and information obtained from Wikimedia Commons: http://commons.wikimedia.org/wiki/File:CERN_members.svg
For more information on CERN, see the Wikipedia article: http://en.wikipedia.org/wiki/CERN