Fifty buildings were destroyed by a 21,500-acre wildfire raging in Northern California that has forced the evacuation of about 3,000 people near the small town of Manton, fire officials said late on Tuesday. Dubbed the Ponderosa Fire, the lightning-sparked blaze roared through brush and heavy timber in Tehama and Shasta counties, about 125 miles north of the state capital Sacramento, since it started on Saturday. Firefighters were finally able to survey the damage from the air in one of the more heavily populated areas affected, to the southeast of tiny Manton, on Tuesday.