Five Best Castles to See in Wales | United Kingdom

Updated June 8, 2026 by Claire No Comments

Wales has more castles per square kilometre than any country in the world — over 600 fortresses and castle sites in a country smaller than Massachusetts — and its greatest medieval castles, built by Edward I in the late 13th century to subdue the Welsh, are among the most impressive and best-preserved examples of military architecture in Europe, collectively designated as a UNESCO World Heritage site. These are not romantic ruins (though Wales has plenty of those too) but massive, functional, terrifying fortifications — the medieval equivalent of a nuclear deterrent, designed to dominate the landscape and the people. The Iron Ring of castles — Conwy, Caernarfon, Beaumaris, and Harlech — represent the pinnacle of medieval castle design and reward a dedicated road trip along the north Welsh coast.

Quick Facts: Wales’s Best Castles

  • 1. Caernarfon Castle: The most impressive of Edward’s castles — intended to evoke the walls of Constantinople, with polygonal towers and banded stonework. The investiture of the Prince of Wales (most recently King Charles in 1969) takes place here. Allow 2–3 hours. Entry: ~£12 (adult)
  • 2. Conwy Castle: The most dramatically sited — eight massive round towers rising from a rocky outcrop overlooking the Conwy Estuary, with the best-preserved medieval town walls in Britain (you can walk a complete circuit of the walls). Entry: ~£12 (adult)
  • 3. Harlech Castle: Perched on a cliff above the Irish Sea, its “Way to the Sea” — a fortified staircase of 108 steps that once allowed supplies to be brought in by ship during sieges — tells the story of the castle’s strategic importance. The views of Snowdonia and the Llyn Peninsula are breathtaking. Entry: ~£9 (adult)
  • 4. Beaumaris Castle (Anglesey): The most technically perfect of Edward’s castles — a concentric design of walls within walls that was never finished (the money ran out). It remains the most beautiful castle that was never completed. Entry: ~£9 (adult)
  • 5. Castell Coch (near Cardiff): A Victorian fairy-tale fantasy — a reconstructed medieval castle by the architect William Burges that looks like it has been lifted from a Brothers Grimm illustration. Not medieval, but utterly magical. Entry: ~£9 (adult)
  • How to visit: The four Edwardian castles can be visited on a 2–3 day road trip along the north Welsh coast — start at Conwy, drive to Caernarfon, cross to Anglesey for Beaumaris, then head south to Harlech. All are managed by Cadw (Welsh heritage) — a 3-day Explorer Pass (~£30) covers all of them
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Have you explored Wales’s Iron Ring of castles or discovered your own favourite Welsh fortress? Share your castle adventures in the comments! 🏰


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