Perched high on Mount Graham at over 10,000 feet, the Mount Graham International Observatory (MGIO) is home to some of the most powerful telescopes on Earth — including the Large Binocular Telescope and the Vatican Advanced Technology Telescope. Operated in part by the University of Arizona, MGIO offers public tours seasonally (May–October), accessible via Discovery Park Campus in Thatcher. It’s a rare fusion of cutting-edge science and remote wilderness, offering visitors a chance to experience professional astronomy amid Arizona’s Sky Islands.
