The Walls of Plasencia encompass a medieval fortification system built following Alfonso VIII's 12th-century reconquest, originally featuring 68 towers. Following an Almohad invasion in 1196, the king deployed 10,000 workers to construct a sophisticated double-wall system with an inner muralla and outer barbacana separated by a moat, reinforced by semicircular towers for flanking defense. Spanning approximately 2.2 kilometers with irregular trace following terrain contours, the fortification once contained 75 towers, of which 20 remain visible today along with preserved gates including Puerta del Sol, Trujillo, Berrozana, and Lucia Tower, making it one of Spain's most complete medieval defensive complexes.