On trip a while back to Southern California, I found my way to the "infamous" Sunken City in San Pedro. A good portion of the entire city slipped off of the edge of the cliff and was reclaimed by the ocean. It is fenced and guarded, but with the right timing and directions, there are ways to get in, which I did. Eerie cool place, and a must see for anyone who is into "Urban Expoloration".