Napa Valley became the home of the first Agricultural Preserve in the U.S. in 1968. a prevalence of volcanic soils that inexplicably add an earthy, "dusty" taste to Napa's best wines The valley floor is 30 miles long and just 5 miles across at its widest point and its rare and unique climate makes it the perfect area for premium wine Napa Valley's geographic location, geology and soil diversity all have influence in the region being...