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A tour of the Carnegie Observatories headquarters in Pasadena, California. The Observatories were founded in 1904 as the Mount Wilson Observatory, which transformed our notion of the cosmos with the discoveries by Edwin Hubble that the universe is much larger than had been thought and that it is expanding. Carnegie astronomers study the cosmos. Unlike most researchers of their topic, they design and build their own instruments. They are tracing the evolution of the universe from the spark of the Big Bang through star and galaxy formation, exploring the structure of the universe, and probing the mysteries of dark matter, dark energy, and the ever-accelerating rate at which the universe is expanding. Carnegie astronomers operate from the Las Campanas Observatory, which was established in 1969. Located high in Chile's Atacama Desert, it affords excellent astronomical observing conditions. As Los Angeles's light encroached more and more on Mount Wilson, day-to-day operations there were transferred to the Mount Wilson Institute in 1986. The newest additions at Las Campanas, twin 6.5-meter reflectors, are remarkable members of the latest generation of giant telescopes. The Carnegie Institution is partnered with several other organizations in constructing the Giant Magellan Telescope.