This imposing four-storey tower house forms part of a historic trio of structures in the area, with a church visible to the southeast and a ringfort to the northwest. Built from coursed limestone rubble with distinctive rounded corners and a protective base-batter, the castle measures 9.2 metres north to south and 12.7 metres east to west, with walls an impressive three metres thick. Though access to the interior is currently restricted by a locked gate, the external architecture reveals much about its defensive design and medieval construction.

The castle’s main entrance, a two-centred doorway with rebated jambs, sits centrally in the eastern wall and would originally have been protected by a machicolation at wall-walk level, though this defensive feature has since been destroyed. Once inside, visitors would have passed through a lobby guarded by a murder-hole overhead before reaching the barrel-vaulted ground floor chamber. From here, stairs tucked into the southeast corner provided the only access to the upper floors. The building’s windows tell a story of both function and status; simple flat and round-headed single lights pierce most walls, whilst the third storey boasts more elaborate twin-light windows with ogee-headed designs, a Gothic flourish that hints at the wealth of its builders.

Historical records reveal that by the mid-17th century, the castle had already fallen into disrepair. The Civil Survey of 1654-6 describes it as a ‘castle out of all repaire’, though it was still listed under the proprietorship of Theobald Purcell of Loughmoe in 1640. Archaeological evidence suggests the tower house was once surrounded by a circular bawn; an earthen and stone enclosure that would have provided additional protection. Though this defensive wall has long since disappeared, its ghostly outline can still be traced through differential vegetation growth around the castle grounds. Despite centuries of neglect, Rahelty Castle remains remarkably well-preserved, offering visitors a tangible connection to medieval Ireland’s turbulent past.