Engineers and architects reveal what went wrong in five engineering disasters, including Baldwin Hills Dam that suddenly gave way, spilling liquid havoc in a quiet LA neighborhood; a mysterious plane crash that killed all aboard (Lockheed Electra); a... (more) massive freighter's shuddering crash into Tampa Bay's Sunshine Skyway Bridge; the 1994 Northridge, California earthquake that shook down poorly engineered buildings; and a 4-decade old coal mine fire that turned Centralia, Pennsylvania into a ghost town.