Caerphilly Castle

Caerphilly Castle: Wales's Largest, with a Leaning Tower That Beats Pisa

Caerphilly's leaning tower tilts more dramatically than the one in Pisa. It is not as tall and it is not as famous, but as a structural consequence of a failed Civil War demolition attempt in the 1640s, it leans at an angle that Pisa cannot match.

The south-east tower of Caerphilly Castle — tipped when Parliamentary forces tried to bring it down and left at its improbable angle when the attempt failed — is the most visible reminder that this is not a castle that has simply been preserved. It has been fought over, besieged, partially demolished and subjected to centuries of deliberate damage, and it is still here: the largest castle in Wales and the second largest in Britain after Windsor.

Gilbert de Clare, the Red Earl of Gloucester, began Caerphilly Castle in 1268, specifically to counter the growing power of Llywelyn ap Gruffudd, the Prince of Wales, who controlled the surrounding territory. Llywelyn burned the first construction in 1270. Gilbert rebuilt it from 1271, completing most of the stone fortress in just three years — a rate of construction remarkable for any medieval project.

What he built was a pioneer of concentric castle design, with multiple defensive walls, a platform for the inner ward surrounded by outer fortifications, and the most extensive water defences yet seen in Britain. Caerphilly covers 30 acres. This guide covers everything you need to plan your visit.

Where Is Caerphilly Castle?

Caerphilly Castle is in the centre of Caerphilly, a town approximately 7 miles north of Cardiff, in South Wales. By car from Cardiff, the journey takes around 20 minutes via the A469 or A470; from the M4 motorway, exit at Junction 32 for the most direct route. Caerphilly railway station, on the Cardiff–Bargoed–Rhymney line, is a ten-minute walk (about 1 kilometre) from the castle. The No. 26 bus between Cardiff and Tredegar stops opposite the castle entrance. The castle is also on National Cycling Network Route 4.

Short-stay and long-stay car parks are available near the castle; spaces vary in distance from the entrance.

A Brief History of Caerphilly Castle

The conflict between Gilbert de Clare and Llywelyn ap Gruffudd was about control of south-east Wales, and the Rhymney Valley — which Caerphilly commands — connected Cardiff with Brecon and the upland territory to the north. When Gilbert began building in 1268, Llywelyn attacked and burned the incomplete work in 1270. The rebuilt castle, rising from 1271, was designed with a defensive sophistication that made it effectively impregnable: concentric walls, massive gatehouses, and an elaborate system of water defences created by damming a local stream to flood the surrounding landscape.

These water defences — artificial lakes and moats covering much of the approach to the castle — were among the most extensive in Britain at the time of their construction, and they gave Caerphilly a strategic advantage that was as much about deterrence as active defence. A castle surrounded by water on three sides and beyond the reach of conventional assault was a castle unlikely to be taken by direct force.

The castle's role changed across the centuries. It served as a residence for the powerful de Clare family and, following Edward II's flight here from his barons in 1326, as a royal refuge. By the 16th century it had fallen into partial decline, its grandeur noted but its fabric neglected.

The Civil War inflicted significant damage — the south-east tower was partially demolished in the 1640s, tipping at its striking angle that became part of the castle's enduring character. A major restoration in the Victorian era and subsequent management by Cadw have brought the castle to its present condition.

The remarkable thing about Caerphilly is the ambition of its original conception. Gilbert de Clare did not merely build a strong castle; he engineered a landscape. The lakes, the platforms, the multiple walls — these were a new kind of thinking about how a fortress should relate to its surroundings.

Architecture & Design

Caerphilly's concentric design — multiple rings of defensive walls, each stronger and higher than the last, so that attackers who broke through one wall faced another — was among the most advanced in Britain at the time of its construction, and influenced castle-building across Wales and beyond.

The inner ward is the heart of the castle: the great hall, the great hall towers and the inner east gatehouse are the principal surviving structures, the great hall having been restored to reflect its medieval grandeur. The outer ward surrounds this with a second ring of fortifications. And beyond the walls, the water defences — the artificial lakes created by the original dam — define the approach and give the castle its distinctive silhouette when viewed from the town.

The leaning south-east tower, tipped at its improbable angle during the 1640s Civil War demolition attempt, is the most immediately striking feature for first-time visitors. The great hall with its audiovisual exhibits is the most informative interior. The north-west tower and the massive inner east gatehouse demonstrate the scale of the defensive works. The whole complex covers 30 acres — described as three times the area of Wales's Principality Stadium — making Caerphilly a site that rewards extended time rather than a quick walk-through.

Note: Parts of the castle are subject to ongoing regeneration works. Some areas may be inaccessible during your visit. Check the official Cadw website before travelling for the current state of access.

Legends & Lore

Caerphilly Castle has no established ghost tradition, but it has served as a setting for modern storytelling of considerable reach. The BBC fantasy series Merlin used the castle's moats, towers and medieval atmosphere as backdrop for Arthurian tales, bringing Caerphilly's architecture to a global audience and establishing it as one of the most visually distinctive filming locations in Wales. The association is appropriate — a vast moated castle in the Welsh hills, the battleground between a Welsh prince and an English earl in the 13th century, seems like natural Arthurian territory.

The historical lore is sufficient. The Red Earl building his fortress against the Welsh Prince; Llywelyn burning it; the rebuilt castle rising in three years; Edward II taking refuge here from his own barons; the Civil War soldiers failing to topple the tower and leaving it at its permanent tilt — these are the stories that Caerphilly carries, and they are more dramatic than any ghost.

Visiting the Castle

Caerphilly Castle is managed by Cadw and is open year-round, with longer hours in summer and shorter hours in winter. Cadw members enter free.

The visit is primarily self-guided, with audiovisual exhibits in the great hall providing historical context. The great hall is the most complete interior space. The leaning tower is the most-photographed feature. The inner east gatehouse and the north-west tower illustrate the scale of the defensive engineering. The water defences — the lakes and moats — are best appreciated from the approach and from the top of accessible towers.

The castle is family-friendly, with the scale of the site giving children space to explore, and the dramatic leaning tower and medieval engineering providing immediate visual appeal. A gift shop is on site.

Note: Due to ongoing regeneration works, some areas of the castle may be temporarily closed. Visitor toilet facilities may be subject to disruption — check the official website for current visitor information before travelling. There is no dedicated café at the castle itself; plan refreshment stops in Caerphilly town centre before or after your visit.

Dogs are welcome in the castle grounds on leads; assistance dogs are welcome throughout. Check the current Cadw policy for any restrictions. Drone use is subject to Cadw's drone policy; confirm before flying.

Check Tickets & Tour Times for Caerphilly Castle →

For current opening hours, prices and access information, check the official Cadw website before your visit.

Where to Stay Near Caerphilly Castle

Caerphilly Castle does not offer visitor accommodation. Caerphilly town centre is within easy walking distance and has a range of accommodation options. Cardiff, 7 miles south (around 20 minutes by road or direct rail), offers the widest choice of hotels, guesthouses and serviced apartments in the region.

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The Best Time to Visit

Spring (April to June) is an excellent time for Caerphilly — the water defences reflect the spring sky, the castle grounds are green and the visitor numbers are lower than in peak summer. Summer (July and August) brings the longest opening hours and the best weather for exploring the full 30 acres of the site. Autumn (September to October) is quieter and the Rhymney Valley landscape around the castle is vivid with autumn colour.

Winter opens the castle for shorter daily hours; the site is quieter and the light dramatic over the water defences on grey days.

How to Get There

By car. From Cardiff, take the A469 or A470 north to Caerphilly; from the M4, exit at Junction 32. The journey from Cardiff takes approximately 20 minutes.

By train. Services on the Cardiff–Bargoed–Rhymney line serve Caerphilly station (around 20 minutes from Cardiff Central), a ten-minute walk from the castle.

By bus. The No. 26 bus between Cardiff and Tredegar stops opposite the castle entrance.

By bike. Caerphilly Castle is on National Cycling Network Route 4.

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Nearby Attractions

Caerphilly sits in the southern Welsh valleys, within easy reach of Cardiff and the wider heritage of South Wales.

Attraction	Why Visit	Distance
Cardiff Castle	A castle with Roman origins and extraordinary Victorian Gothic State Apartments — the centrepiece of the Welsh capital	~7 miles
Castell Coch (Cadw)	A Victorian Gothic fantasy castle by William Burges in the woods above the Taff Valley — one of the most unusual buildings in Wales	~9 miles
Caerphilly Town Centre	The market town surrounding the castle — easy to combine with a castle visit	Adjacent
Raglan Castle (Cadw)	A magnificent mid-15th-century castle ruin in Monmouthshire — one of the finest late medieval castles in Wales	~25 miles
Newport	A city with Roman origins (the Roman fortress of Isca Silurum is nearby) and the Newport Transporter Bridge	~16 miles

A natural South Wales day pairs Caerphilly Castle with Cardiff Castle and Castell Coch — three castles within 10 miles, spanning Norman, medieval and Victorian Gothic eras.

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Family & Accessibility

Families. Caerphilly is an outstanding family castle. The leaning tower, the vast water defences, the scale of the site and the audiovisual exhibits in the great hall all work well for families. The 30-acre extent gives children room to explore. It is consistently rated as one of the best family castle experiences in Wales.

Accessibility. The castle has dedicated accessible parking and a portable induction loop. Some areas involve uneven surfaces and steps; check the Cadw accessibility information before visiting for detailed guidance on accessible routes. Assistance dogs are welcome. Photography is permitted for personal use.

Practical Tips

• Book tickets online to guarantee entry and for any available discounts — check the official Cadw website.
• Wear comfortable walking shoes with grip — the castle grounds cover 30 acres of grass, gravel and medieval stone surfaces.
• Pack a compact travel umbrella; the South Wales climate is changeable.
• Bring a portable power bank for a full day of photography across the castle and water defences.
• Check the Cadw website before visiting — ongoing regeneration works mean some areas may be inaccessible, and visitor facilities may be temporarily disrupted.
• Drone use is subject to Cadw's drone policy — confirm before flying.
• Overseas visitor? Pack a UK travel adapter for Type G plugs.

Conclusion

Caerphilly Castle is the largest castle in Wales and the second largest in Britain, built in three years in the 1270s by an English earl to contain a Welsh prince, and still standing in the centre of a Welsh market town 750 years later. Its concentric walls and water defences changed the thinking about how a castle should be designed.

Its leaning tower — left at its angle after a failed Civil War demolition — is one of the most distinctive structures at any castle in Britain. BBC Merlin recognised what was in front of it: an authentic, atmospheric medieval fortress on a scale that few British castles can match. Seven miles from Cardiff, it is one of the easiest great castles in Britain to visit.

Frequently Asked Questions

What are the opening hours of Caerphilly Castle?

The castle is open year-round, with longer hours in summer (broadly April to October) and shorter hours in winter. Check the official Cadw website for the current seasonal hours before travelling.

How much does it cost to visit Caerphilly Castle?

Admission fees vary by age; Cadw members enter free. Check the official Cadw website for current prices. Some areas may currently be inaccessible due to ongoing regeneration works — check the website for any current visitor information.

How big is Caerphilly Castle?

Caerphilly covers 30 acres, making it the largest castle in Wales and the second largest in Britain after Windsor Castle. It is often described as three times the size of the Principality Stadium in Cardiff.

What is the story of Caerphilly's leaning tower?

During the English Civil War in the 1640s, Parliamentary forces attempted to demolish the south-east tower. The attempt failed, leaving the tower permanently tipped at its dramatic angle — more severe than the lean of the Tower of Pisa.

Is Caerphilly Castle the setting for the BBC series Merlin?

Yes — Caerphilly Castle served as a principal filming location for the BBC fantasy series Merlin, its water defences, towers and medieval atmosphere providing the backdrop for Arthurian stories.

Is Caerphilly Castle suitable for children?

Very much so — it is consistently rated as one of the best family castles in Wales. The leaning tower, the scale of the site, the water defences and the audiovisual exhibits in the great hall all work well for families.

Is Caerphilly Castle wheelchair accessible?

Dedicated accessible parking and a portable induction loop are available. Some areas involve uneven surfaces. Check the Cadw accessibility guide before visiting.

How do I get to Caerphilly Castle from Cardiff?

By car: approximately 20 minutes via the A469 or A470, or from Junction 32 of the M4. By train: around 20 minutes from Cardiff Central on the Cardiff–Bargoed–Rhymney line. By bus: the No. 26 service stops opposite the entrance.

Is there a café at Caerphilly Castle?

No dedicated café is operated at the castle. Check locally in Caerphilly town centre for refreshments. A gift shop is on site.

Can I take photos at Caerphilly Castle?

Photography is permitted for personal use throughout the castle. Drone use is subject to Cadw's drone policy — confirm before flying.