Conwy Town Walls

Conwy's town walls are a medieval defensive structure around the town of Conwy in North Wales. The walls were constructed between 1283 and 1287 after the foundation of Conwy by Edward I, and were designed to form an integrated system of defence alongside Conwy Castle. The walls are 1.3 km (0.81 mi) long and include 21 towers and three gatehouses - source via Wikipedia.