Africa's oldest known defensive wall outside Egypt discovered, and it's 4,000 years old

The largest defensive wall at Oued Beht. Archaeologists think its base was constructed about 4,000 years ago. (Image credit: G. Lucarini, Oued Beht Archaeological Project)Archaeologists have unearthed 4,000-year-old defensive walls in Morocco that are the oldest structures of their kind in North Africa outside the Nile Valley.The discovery expands what's known about the human development of this region of northwestern Mediterranean Africa, known as the Maghreb, particularly about the adoption of agriculture."For more than a century, the Maghreb was treated as a blank space in the story of Mediterranean later prehistory," Giulio Lucarini, an archaeologist at Italy's National Research Council,...