The legendary swallows aren't the only annual returnees to San Juan Capistrano. The great coastal mission draws more than 500,000 visitors a year into the southern reaches of Orange County. The most famous of all the missions in the California system established in the 18th century by Franciscan friar Junipero Serra, Mission San Juan Capistrano still contains the Serra Chapel, the oldest church in California, and the only building still standing where...