Ross Castle

Ross Castle stands on a peninsula in Lough Leane, the largest of the three Killarney lakes, its stone keep reflected in water with the MacGillycuddy's Reeks rising behind — a composition that has appeared on more Kerry tourism images than any other single structure. The castle is beautiful in itself, but it is the landscape setting that makes it extraordinary: the largest mountain range in Ireland, the largest lake in the Killarney National Park, and a 15th-century tower house that has stood in exactly this position for nearly 600 years.

The castle was built around 1440 by O'Donoghue Mór, the chief of the O'Donoghue clan and the principal Gaelic Irish lord of the Killarney region in the late medieval period. The 'Mór' designation (meaning 'great') distinguishes the main line of the O'Donoghue from the O'Donoghue Fionn ('fair') branch, and the title has continued to be used by the chief of the clan into the present day. The tower house they built at Ross follows the canonical form of the Kerry and Munster Gaelic Irish castle: a four-storey square keep of solid rubble masonry, with rounded corner bartizans projecting at each angle, murder holes and machicolations over the entrance, narrow slit windows on the lower floors and larger windows with window seats above, and a great hall on the upper floor. The surrounding bawn — the walled defensive enclosure — has two flanking towers on the lakeside, creating a defensive perimeter that would have also served as a corral for the clan's livestock in times of threat.

The castle's most historically significant moment came in 1652, at the end of the Cromwellian conquest of Ireland. By that date, Ross Castle was one of the last Gaelic and Confederate Catholic holdouts in Munster. Donal MacCarthy, Lord Muskerry, commanded the garrison and held the castle through the winter. Cromwellian general Ludlow attempted the conventional assault first, and failed: the thick walls and lake position made direct attack impossible. The solution was transport: artillery was broken down and carried across the mountains to be reassembled on boats — an operation of considerable difficulty in the Kerry terrain — and floated across Lough Leane to batter the castle from the water. This manoeuvre proved decisive. A local prophecy had long held that Ross Castle would only fall to 'a weapon coming from the sea' (by one version, to an attack by boat). When the gun-boats appeared on the lake, the garrison, confronted with both the artillery and the fulfilment of the prophecy, surrendered. MacCarthy went into Continental exile. The Cromwellian period that followed effectively ended the Gaelic Irish order that had maintained Ross Castle's cultural character for two centuries.

The castle passed through various post-Cromwellian owners and was used as a military barracks into the 19th century. The Office of Public Works (now Heritage Ireland) took it over in the 20th century and carried out a restoration, refurnishing the interior with period furniture to represent the appearance of a 16th-century Kerry chief's household — the great hall with its fireplace and long table, the private chambers above, the service areas below. The interior tour, which is guided and requires advance booking, covers the four floors of the keep with reference to the O'Donoghue household at the height of the castle's Gaelic period.

The GYG-listed tour (t933283, 4.5★, 16 reviews, from $57, 3 hours) is a scenic Killarney National Park half-day tour covering Torc Waterfall, the Lakes of Killarney, and Ross Castle — but the Ross Castle visit is **exterior only**. The GYG 'Includes' list explicitly states 'Ross Castle visit from outside,' and the castle's own site notes that interior access requires separate pre-booking through Heritage Ireland. Visitors who want the guided interior tour of the keep should book separately at heritageireland.ie in advance of visiting — interior tours run seasonally (typically April to October) and sell out at peak times. The exterior visit, the bawn, and the lakeside views are freely accessible without a ticket and are genuinely rewarding in their own right.