From http://www.ociw.edu/about/ :

"Fifty-two hundred miles southeast of Pasadena, about a dozen scientists and administrative personnel work in the offices of the Las Campanas Observatory located in the coastal resort city of La Serena, Chile. The observatory itself is located approximately 100 kilometers north of La Serena, Chile, at an altitude of 2,400 meters, in a region of dark and clear skies and excellent seeing unsurpassed by any site on Earth. The principal telescopes at Las Campanas are the Swope 1-meter telescope, the du Pont 2.5-meter telescope, and the twin 6.5-meter Magellan telescopes."