Conwy Castle - This castle was built by the English king Edward I during his conquest of Wales in the late 1200s along with the town walls of Conwy. It sits above the Conwy River at a strategic crossing point. The castle has water access which allowed it to be resupplied from the ocean.
Caernarfon Castle - Built right on the ocean next to a little harbor, this large medieval castle replaced a different fortress structure that existed before 1283. The current castle was finished around 1330 along with the walls around the village. The castle has been besieged and used in war multiple times throughout history.
Caerphilly Castle - Located in the quaint village of Caerphilly, minutes from Cardiff, this castle was built in 1290 by the English nobleman Gilbert de Clare. It was the first castle to feature walls within walls. It also used an artificial lake as a moat