A triumphal arch that formerly announced entrance to the Oak Park estate in County Carlow. Constructed of crisp granite, it dates from the late 1830s when designed by William Vitruvius Morrison for owner Colonel Henry Bruen. The external side has flanking screen walls and a carriage turn, while there are paired Ionic columns on either side of the arch. The park side is simpler with Doric pilasters. It seems the architect and his father, Sir Richard Morrison, had previously proposed a similar design to both Barons Court, County Tyrone and Castle Coole, County Fermanagh, so this is a case of third time lucky. There are rooms on either side of the arch which seemingly was occupied up to 1970. The gates which once stood inside the arch are long-since gone as this is now a public road.