Spanish explorers named the bay San Francisco on Nov. 7, 1595. It was called Yerba Buena, Spanish for Good Herb, because mint grew in abundance there. It was renamed San Francisco in 1847 and became incorporated as a city in 1850. Tourism is one of San Francisco's largest industries and the largest employer of city residents. In 2000, more than 17 million people visited San Francisco, and visitor spending was $7.6 billion, providing 82,000 jobs.