Which high energy particle collider was completed first, the Tevatron or the Large Hadron Collider? 
Tevatron: The Tevatron was a circular particle accelerator (now inactive, since 2011) in the United States, at the Fermi National Accelerator Laboratory (also known as "Fermilab"), just east of Batavia, Illinois, and holds the title of the second highest energy particle collider in the world, after the Large Hadron Collider (LHC) of the European Organization for Nuclear Research (CERN) near Geneva, Switzerland. Tevatron:  The Tevatron was completed in 1983 at a cost of $120 million and significant upgrade investments were made in 1983–2011. Large Hadron Collider: The Large Hadron Collider (LHC) is the world's largest and most powerful particle collider, most complex experimental facility ever built, and the largest single machine in the world. Large Hadron Collider:  It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and engineers from over 100 countries, as well as hundreds of universities and laboratories.
The Tevatron