One of the top ten largest cities in the USA, San Diego is located at the very south of California, not far from the border with Mexico. It is often rates as one of the country’s most "liveable” cities and is an important center for manufacturing. In recent years San Diego has also become associated with hi-tech industries like computer sciences and biotechnology. Tourism is also important to the city, and you can find a host of interesting museums, including the Natural History Museum and the San Diego Museum of Man.