LOS ANGELES – The destruction wrought by a wind-driven wildfire in the mountains northeast of Los Angeles approached 156 square miles (404 square kilometers) Sunday, burning structures, homes and a nature center in a famed Southern California wildlife sanctuary in foothill desert communities.Firefighters were, however, able to defend Mount Wilson, which overlooks greater Los Angeles in the San Gabriel Mountains and has a historic observatory founded more than a century ago and numerous broadcast antennas serving Southern California, from the Bobcat Fire.The Bobcat Fire started Sept.