On January 17, 1994, at 4:31 am, a magnitude 6.7 earthquake struck the San Fernando Valley region of Los Angeles, killing more than 60, injuring more than 9,000, and causing widespread damage. Freeways crumbled, gas mains burst and caught fire, apartment complexes collapsed, and power was lost to vast sections of the city. Thousands of buildings were either destroyed outright, or declared unsafe to enter, and later demolished. Twenty years later, here is a look back, in photos.