Mission Bells on the 101 Freeway and other locations have been in place since the early 20th Century to mark the original route of El Camino Real (Spanish for Highway of the King or Royal Highway) from San Diego to Sonoma. The 700-mile-long El Camino Real linked California's 21 missions, which were founded by Father Junipero Serra and spaced approximately one day's journey apart by horse. Over the years, El Camino Real gave way to modern highways, principally Routes 101 and 82.
