If you like the Old-Spanish style architecture, you can find examples in the oldest parts of the county – neighborhoods like Point Loma, Mission Hills, Kensington, and Oceanside.
Excerpts from wiki’s Oceanside entry:
Although the area was first settled by Native Americans, the first European explorers arrived in 1769. The Spanish missionaries under Father Junipero Serra founded Mission San Luis Rey de Francia on a former site of a Luiseño Indian village on the banks of the San Luis Rey River. In the early 19th century, the introduction of farming and grazing changed the landscape of what would become Oceanside. The area – like all of California – was under Spanish, then in 1821 under Mexican rule, and conquered by the U.S. in 1848.
In the late 1850s, Andrew Jackson Myers lived in San Joaquin County. A native of LaSalle County, Illinois, he returned in the late 1880s and lived in San Luis Rey. In 1882 Myers moved on the land that was the original town site for Oceanside. A patent for the land was issued in 1883 by the federal government. It was incorporated on July 3, 1888. The city hall as of the early 21st century stands on the former Myers homestead.
In the 20th century, Oceanside was a beach town devoted to activities on a 6-mile (9.7 km) stretch of beaches. Residential areas like downtown (built in the 1890s), South Oceanside (built in the 1920s and 1930s), and developments east of Interstate 5 (built after World War II) are preserved and remodeled. Since the establishment of Marine Corps Base Camp Pendleton in 1942, Oceanside has been home to U.S. armed forces personnel, and the wartime industry of WWII – in the 1950s there was an ammunition manufacturing facility in the city.
In the 1960s, Oceanside beaches had been a mecca for tourists, and the town flourished up until 1972 – that’s when the new-car dealers uprooted from Hill Street (now Coast Hwy.) and moved to Car Country Carlsbad.