Best castles around Westport-Belmullet Municipal District are found in a region of County Mayo, Ireland, known for its coastal landscapes along Clew Bay and the Wild Atlantic Way. This area features a rich history, with many sites linked to the 16th-century "Pirate Queen," Grace O'Malley. The district encompasses diverse natural features, including islands like Achill Island and strategic waterways. Historical structures, from tower houses to mansion estates, are integrated into this landscape.
Last updated: June 29, 2026
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Westport House is often considered the most beautiful historic house in Ireland. The current building dates from 1730 and was designed by the famous architects Richard Cassels and James Wyatt at the behest of the Browne family (the Earls of Altamont and later Marquesses of Sligo). It is built on the ruins of a castle belonging to the pirate queen Grace O'Malley.
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A fascinating place - it's a towerhouse, built in mid-fifteenth century,, typically thought to be owned by Grace O'Malley, called 'a pirate queen', who was the chieftain of the Clan O'Malley.
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Right next door is the ruin of an abbey with some typical high crosses.
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Also known as Doona Castle, the ruins here watch over a strategic stretch of water. It is said that over 400 crew of a Spanish ship that beached here set up camp around the castle in the 16th century.
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Castleaffy Castle sits overlooking an inlet on Clew Bay. It was built in this strategic position as the inlet is too shallow to accommodate ships so it was a place of safety from the English.
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Also known as Carrickkildavnet Castle, the tower house was the home of Ireland's 16th century Pirate Queen, Gráinne Ní Mháille (Grace O'Malley). The castle guards the strategic point of the mouth of the Achill Sound. You can cross the stile to explore the castle for free.
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This castle is a typical tower house for the region, which was built in the 15th century. At that time it was used to protect the elongated estuary that separates Achill Island from the Corraun Peninsula. In the 16th century the building was one of the fortresses of the pirate queen Grace O'Malley (Gráinne Ni Mháille, also Granuaile).
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Several castles in the region have strong ties to Grace O'Malley. Rockfleet Castle (Carrigahowley Castle) near Newport was her primary stronghold. Kildavnet Castle on Achill Island also served as one of her fortresses. Additionally, Westport House stands on the site of an earlier castle built by Grace O'Malley herself.
The castles in the Westport-Belmullet Municipal District are primarily 15th and 16th-century tower houses, reflecting a period of clan power and maritime activity. Many, like Kildavnet Castle, were strategically built to protect waterways. They offer insights into the defensive architecture and the lives of powerful figures like Grace O'Malley. Even ruins like those at Glencastle hint at ancient territorial struggles and folklore.
You can experience a mix of both. While many, like Castleaffy Castle and Fahy Castle and Abbey Ruins, are atmospheric ruins, Westport House offers a well-preserved 18th-century Palladian mansion built on the site of an earlier O'Malley castle, complete with attractions and public access.
While not directly within the Westport-Belmullet Municipal District, County Mayo is home to Ashford Castle near Cong, a luxurious 5-star hotel set in 350 acres of gardens. Another option is Belleek Castle near Ballina, which operates as a boutique hotel and features a museum with 16th-century armor. Both offer dining and unique experiences for non-guests.
Rockfleet Castle, with its dramatic coastal setting near Newport on Clew Bay, offers stunning views from afar. Kildavnet Castle on Achill Island overlooks Achill Sound, providing rugged, windswept vistas along the Wild Atlantic Way. Castleaffy Castle also boasts scenic views overlooking an inlet on Clew Bay.
Westport House offers tours of its historic mansion and estate. For other sites like Kildavnet Castle or Castleaffy Castle, which are often ruins or viewed from the exterior, formal guided tours may not be consistently available. It's best to check with local visitor centers for information on any walking tours that might include these sites.
The spring and summer months (May to September) generally offer the most favorable weather for exploring the castles and their outdoor settings. This period provides longer daylight hours and milder temperatures, ideal for enjoying coastal views and walking around the sites. Some sites, especially ruins, are accessible year-round, but facilities and weather conditions can vary in winter.
Accessibility varies greatly depending on the castle. Westport House, as a modern attraction, offers better accessibility for prams and wheelchairs within its main areas. However, many of the older tower houses and ruins, such as Kildavnet Castle or Rockfleet Castle, are historic structures with uneven terrain, narrow entrances, and stairs, making them challenging for prams and largely inaccessible for wheelchairs. Viewing these from the exterior is often the most feasible option.
Westport House is highly recommended for families. Beyond its historical significance, it offers numerous attractions and activities suitable for all ages on its estate. While other castles like Kildavnet Castle are interesting for their history, their appeal to younger children might be limited to exploring the exterior and enjoying the scenic surroundings.
The region offers a wealth of outdoor activities. You can find numerous cycling routes, including the challenging Westport to Achill and back on the Great Western Greenway, or the scenic Achill Island loop from Keel. For hikers, there are easy trails like the Keem Bay Beach and Cliff loop on Achill Island or the Erris Head Loop Walk near Belmullet. Mountain biking trails are also available, such as the Westport to Croagh Patrick loop. You can find more details on these activities in the Cycling around Westport-Belmullet Municipal District, Easy hikes around Westport-Belmullet Municipal District, and MTB Trails around Westport-Belmullet Municipal District guides.
While not extensively documented, the remains of Glencastle near Belmullet offer a glimpse into ancient history. Though not archaeologically investigated, its three large mounds are believed to mark the site of a 16th-century castle and are linked to Celtic folklore, providing a unique, off-the-beaten-path historical experience.
Parking availability varies. Westport House has dedicated parking facilities for visitors. For more remote sites like Kildavnet Castle or Rockfleet Castle, you might find informal parking areas nearby or roadside parking. It's advisable to check local signage and be mindful of private property when visiting these sites.

