Caernarfon Castle is a colossal medieval fortress and a UNESCO World Heritage site, famous for its unique polygonal towers and banded masonry that were inspired by the walls of Constantinople. Built by Edward I on the site of an earlier Roman fort, it was intended as a grand seat of government and a symbol of royal authority in Wales. The castle remains particularly significant as the location for the investiture of the Prince of Wales. Its formidable gatehouses and enormous battlements offer an immersive look at the power and scale of medieval statecraft, standing as one of the most recognizable and impressively preserved castles in the world.