The Silverado Trail is a scenic route that travels 29 miles along the Eastern edge of the Napa Valley, parallel to and several miles to the east of California State Route 29.==History==The road began as a trail built in 1852 after flooding made the main Napa Valley road impassible. Later, it served as a wagon trail to link cinnabar mines on Mount St. Helena to San Pablo Bay, the northern portion of the San Francisco Bay, and was the first permanent road from Napa to Calistoga. - Source: Wikipedia
