Standing majestically beside the River Nore on the south side of Kilkenny City, this landmark medieval castle was built in the 12th century and remodeled in Victorian times. From its sturdy corner towers to its battlements, Kilkenny Castle retains the imposing lines of an authentic fortress. The exquisitely restored interior includes a library, drawing room, and bedrooms, all decorated in 1830s style. The former servants’ quarters are now an art gallery. The 20-hectare (49-acre) grounds include a riverside walk, extensive gardens, and a well-equipped children’s playground. This is a very busy site, so arrive early (or towards the end of the day) to avoid waiting.