Eagle Tower
The largest tower in the castle, framing the Snowdonia peaks and Anglesey from a single vantage point.
Llywelyn2000 — CC BY-SA 4.0 · Tilman2007 — CC BY-SA 4.0 · Tilman2007 — CC BY-SA 4.0 · Tilman2007 — CC BY-SA 4.0
Historians have long read Caernarfon as Edward I's attempt to make his greatest Welsh castle echo the walls of Constantinople: the towers are polygonal rather than round, and the masonry is banded with a dark stone stripe you will not see on any other fortress in the region. Work began in 1283 on the shore of the Menai Strait, and defence was only half the point; the rest was theatre. This was to be the administrative capital of North Wales and a royal palace as much as a stronghold, which is why it is the grandest and most palatial of the four Edwardian castles listed together as a UNESCO World Heritage Site alongside Conwy, Harlech and Beaumaris. The first view from the little harbour outside the gate is worth the stop on its own, but the interior is what earns the drive. Wall-walks link the towers through stone passages, and the climb up the Eagle Tower, the largest in the castle, opens the Snowdonia peaks on one side and Anglesey on the other. The investitures of the Prince of Wales were staged here in 1911 and 1969; an exhibition tells that story, and the Royal Welch Fusiliers regimental museum occupies two of the towers, covered by the same ticket at no extra charge. A plain word for families: Cadw grades the site as strenuous, and the spiral stairs are narrow and uneven, so pushchairs stay in the courtyard and under-fives will need carrying on the steps. The upper floors of the King's Gate are shut until the lift is repaired, and the castle cafe is also closed, replaced by a pop-up stand that opens Friday to Sunday outside summer. The upside is that the town is a minute's walk away, full of cafes and restaurants, and its medieval walls ring those streets as a free coda to the visit. From the heart of Snowdonia, Caernarfon is about 13 km from Llanberis, roughly a 20-minute drive, and around 45 minutes from Betws-y-Coed. The nearest parking is the pay-and-display Slate Quay right beside the castle, which fills by late morning in the school holidays, so come early. Adults pay £14.90 and a family ticket for two adults and up to three children is £47.70, with 5% off online. No advance booking is needed. Doors stay open until 18:00 in July and August, while winter hours run 10:00 to 16:00, with last entry half an hour before closing.
The largest tower in the castle, framing the Snowdonia peaks and Anglesey from a single vantage point.
Stone passages link the towers and give you the whole castle from above, with the Menai Strait below.
Long read as a deliberate echo of Constantinople's walls, unlike anything on Wales's other castles.
Castle Ditch, Caernarfon LL55 2AY
Caernarfon if you want scale, grandeur, the exhibition and the museum; Conwy if you want a castle that feels more intact inside, with a prettier walled town around it. With young children we would lean Conwy, whose stairs are kinder; Caernarfon rewards those who can climb the towers.
Yes, it stays open all year except 24–26 December and 1 January, but winter hours are 10:00 to 16:00 and the light goes before that, so make it a morning stop and expect a cold wind on the open wall-walks, with only a weekend pop-up stand for refreshments.