The area thrived with the growing prominence of California wine. One of the wineries on the road, Stag's Leap Wine Cellars, made Napa Valley world-famous in 1976 when it won the Judgment of Paris, a promotional wine competition among French and California wines. Today, at least 40 of the Valley's more than 200 wineries are along or near the road. Each year in March, the route also plays host to the annual Napa Valley Marathon.