Barberstown Castle is a structure originally built in 1288 in Straffan

Straffan

Sruthán was mistakenly cited by Thomas O'Connor in the Ordnance Survey Letters in 1837, and adopted as the Irish form of Straffan. Seosamh Laoide used it in his list of Irish names of post-offices published in Post-Sheanchas . An Sruthán gained currency among those involved in the Irish revival...

, Co. Kildare. It has been operating as a hotel since 1971 and is surrounded by 20 acres (80,937.2 m²) of gardens. Renovations in 1996 revealed a previously undiscovered tunnel that links the castle to the nearby church in Straffan

Straffan

Sruthán was mistakenly cited by Thomas O'Connor in the Ordnance Survey Letters in 1837, and adopted as the Irish form of Straffan. Seosamh Laoide used it in his list of Irish names of post-offices published in Post-Sheanchas . An Sruthán gained currency among those involved in the Irish revival...

 and is thought to have been used during penal times.