Eagle Tower is the largest and most impressive element of Caernarfon Castle. You might notice the carvings of eagles decorating the battlements. Its ten-sided design measures 33 feet at the base. It was the first structure to be built, intended to repel attacks by sea until the rest of the stronghold could be finished. Look closely at the area of rough stone. This was the foundation of a water gate that was never constructed. The steps leading to the arched doorway was used to accept ship deliveries.