Sutter's Mill was a sawmill located in Coloma, California, built by John Sutter in 1846. It is historically significant as the site where gold was discovered in January 1848, which sparked the California Gold Rush. The mill was originally intended to process lumber for Sutter's agricultural and trading enterprises. The discovery of gold at Sutter's Mill led to a massive influx of people seeking fortune, dramatically changing California's population and economy. This event marked a pivotal moment in American history, influencing westward expansion and the development of the American West. Today, the site is preserved as a historic park.