Caernarfon stands as a formidable stone sentinel on the banks of the Menai Strait. The town is dominated by its castle, a massive fortress with polygonal towers and banded masonry inspired by the walls of Constantinople. My top tip is to walk the narrow, medieval Hole in the Wall street to find hidden local taverns. You can explore the Roman ruins at Segontium on the hill for free. The Welsh Highland Railway starts its journey here, with steam trains puffing past the ancient walls toward the heart of Eryri. Traditional slate and stone buildings line the bustling square where local markets have been held for centuries. The scent of woodsmoke and sea air drifts through the town. Life here is anchored in its royal history and the Welsh language. It is a powerful spot for a heritage break with pets welcome on the scenic waterfront paths.