Lismore Castle in County Waterford is a striking castle completed in 1860, featuring Victorian architecture within a setting of exceptional historical significance. Originally built in 1185 by Prince John, the future King of England, the castle later passed to Elizabethan courtier and explorer Sir Walter Raleigh. Since 1753, it has been the Irish home of the Duke and Duchess of Devonshire's family. While the castle itself remains a private residence, visitors can explore its renowned historic gardens, arranged across seven acres within 17th-century outer defensive walls. These gardens are among Ireland's oldest continually cultivated, surrounded by woodland, grassy fields, and floodplains overlooking the beautiful Blackwater River, creating a picturesque heritage landscape.