Top 10 Castles in South Wales

South Wales is steeped in history, with its landscape dotted by some of the most dramatic and well-preserved castles in the British Isles. From mighty Norman fortresses to romantic ruins nestled in valleys, these castles offer a fascinating glimpse into Wales’s turbulent past of conquest, rebellion and royalty. If you're exploring the region's history, these are our top ten castles in South Wales we think you should explore, however there are so many more options spread right across South Wales.

1. Caerphilly Castle

Dominating the town of Caerphilly, this is the largest castle in Wales and second only to Windsor in the UK. Built in the 13th century by Gilbert de Clare as a stronghold against Welsh prince Llywelyn ap Gruffudd, Caerphilly Castle is famous for its vast moats, imposing towers and concentric design. One of its most striking features is the leaning south-east tower, which rivals the Tower of Pisa in its angle.

The site has been well-restored, with towers to climb, medieval siege engines to examine and an impressive great hall. It’s an ideal place for families and history lovers to explore the scale and power of Norman architecture.

2. Chepstow Castle

Perched dramatically above the River Wye, Chepstow Castle is the oldest surviving stone-built castle in Britain, with its construction beginning in 1067. It was built by William FitzOsbern, a close ally of William the Conqueror, and has been extended and modified over centuries.

The castle's clifftop location, fortified gates and spectacular views make it one of the most visually striking fortresses in Wales. Visitors can explore the medieval towers and walk along the castle walls while imagining its life as a frontier post on the English-Welsh border.

3. Coity Castle

Coity Castle is a fascinating medieval ruin located just outside Bridgend. Originally built around the early 12th century by Payn de Turberville, one of the legendary Twelve Knights of Glamorgan, the castle was later expanded and modified over several centuries. It served both as a stronghold and as a noble residence for the de Turberville and Gamage families.

Today, Coity stands as an atmospheric ruin with a partially preserved keep, curtain walls and living quarters that reveal the layered history of the site. You can wander freely among the remains, with excellent views of the surrounding landscape and a real sense of its medieval past.

Though less visited than some of the more famous fortresses, Coity Castle offers a quiet, authentic experience that rewards those seeking out South Wales’s lesser-known gems.

4. Raglan Castle

Unlike many other castles on this list, Raglan Castle near Monmouth is a product of the later medieval period, built for luxury as much as defence. Constructed in the 15th century, it was one of the last true castles to be built in Wales and boasts an elegant blend of fortress and palace.

The standout feature is the great tower, which once rose from a moat and served as a grand residential space. Although partially ruined after the Civil War, Raglan retains an air of opulence and refinement, with impressive window frames, spiral staircases and battlements still intact.

5. Kidwelly Castle

Located on the banks of the River Gwendraeth in Carmarthenshire, Kidwelly Castle is one of the finest surviving examples of a Norman fortress. With its symmetrical curtain walls, four corner towers and inner gatehouse, the layout is both functional and picturesque.

Kidwelly is quieter than some of the more famous sites, making it an ideal spot for a more relaxed visit. It’s also well-known for featuring in the opening scene of Monty Python and the Holy Grail. The extensive grounds and impressive remains make it a rewarding stop for both history enthusiasts and casual sightseers.

6. Carreg Cennen Castle

Perched high on a limestone crag near the edge of the Brecon Beacons, Carreg Cennen is one of the most spectacularly located castles in Wales. The views from the castle walls stretch for miles across valleys and moorland.

Though mostly in ruins, Carreg Cennen retains a wild, romantic atmosphere. One of its most unique features is a natural cave that leads beneath the castle - a passage that can still be explored with a torch. The site is remote, but its dramatic setting more than repays the effort to reach it.

7. Laugharne Castle

Overlooking the Taf estuary, Laugharne Castle began as a Norman stronghold but was later transformed into a Tudor mansion. It is perhaps best known today for its literary connections - Dylan Thomas lived nearby and wrote many of his works while staring out at the castle from his boathouse.

Visitors can explore its atmospheric ruins and climb the towers for sweeping estuary views. With its garden walk and riverside location, Laugharne Castle offers a blend of history, poetry and beauty that’s hard to beat.

8. Castell Coch

Just north of Cardiff, nestled in the woodlands of Tongwynlais, Castell Coch ("Red Castle") is a 19th-century fairytale fortress built on medieval foundations. Commissioned by the Marquess of Bute and designed by the architect William Burges, this Gothic Revival masterpiece blends romantic fantasy with historical detail.

The castle’s turrets, richly decorated interiors and surrounding forest trails make it a magical destination for visitors of all ages. Though not a defensive stronghold in the traditional sense, Castell Coch represents Victorian imagination at its finest and is an unmissable highlight of South Wales.

9. Dinefwr Castle

Standing above the River Tywi in Carmarthenshire, Dinefwr Castle is surrounded by ancient woodland and lush parkland. Once the seat of the powerful Lord Rhys, ruler of the Kingdom of Deheubarth, the castle has deep roots in Welsh history.

Today, visitors can climb the remaining walls and tower to enjoy panoramic views over the Tywi Valley. The nearby Newton House and Dinefwr Park offer further attractions, including deer herds, nature trails and historical exhibitions. The whole site is rich in atmosphere and perfect for a day of walking and exploring.

10. Ogmore Castle

Set on the banks of the River Ewenny, Ogmore Castle is a modest but beautifully situated ruin near Bridgend, often overlooked by tourists. Built during the early Norman conquest of Glamorgan, its most striking feature is the well-preserved keep and the nearby stepping stones that cross the river.

Though small, Ogmore has a timeless charm and is particularly popular with walkers exploring the surrounding countryside and coastal paths. The site is open and free to explore, making it an ideal picnic or photography stop on a sunny day.

Final Thoughts

With somewhere in the region of 400 castles built in South Wales, and around 100 still standing or in ruins, the region offers a rich tapestry of medieval history, and its castles are among the most exciting and immersive ways to explore it. Whether you’re climbing the mighty battlements of Caerphilly, wandering through the romantic ruins of Carreg Cennen, or discovering the fantasy architecture of Castell Coch, each site tells a unique story of power, ambition and imagination.

Almost an impossible task to choose, but these top 10 castles in South Wales showcase the diversity of our heritage - from Norman strongholds and royal residences to hidden gems and literary landmarks. Whether you're a history enthusiast, casual visitor or keen photographer, each location offers something special and memorable. Your journey through Wales’s castle-studded landscape is bound to be both captivating and unforgettable.