Bath's city walls were a sequence of defensive structures built around the city of Bath in England. Roman in origin, then restored by the Anglo-Saxons, and later strengthened in the High medieval period, the walls formed a complete circuit, covering the historic core of the modern city, an area of approximately 23 acres (9.3 ha) including the Roman Baths and medieval Bath Abbey. In the mid 18th century most of the town walls and gatehouses were demolished to accommodate the Georgian development of the town. However, the line of the walls can still be traced in the town's street layout.