The most popular spot in San Pedro, California is also the toughest ticket in town. It’s closed off, behind a gated fence, and clearly marked with “no trespassing” signs. So how did the “Sunken City” become an online phenomenon? Take away the access, and this collection of hiking trails that overlook the Pacific Ocean, with Catalina Island some 22 miles away directly across, is now a must-see ticket. There’s several Sunken City Facebook fan pages,  over 50,000 #SunkenCity has