The Kitt Peak National Observatory is located in the Quinlan Mountains, southwest of Tucson, Arizona. For more than 40 years, astronomers have used the telescopes here to make many remarkable discoveries about the Universe. Today, Kitt Peak is the most visited astronomical observatory site in the world. With over twenty telescopes of different types and sizes, the site gives visitors an indication of the great diversity of modern astronomy. This guide gives a comprehensive tour of the Kitt Peak telescopes, and introduces some of the important science that is done with them. It also points out some of the beautiful surrounding scenery, and gives an idea of what it is like to be an astronomer on the mountain. The book will enable visitors to make the most of their trip, and contains color-coded walking tours of the telescopes.