Johnstown Castle is a Gothic Revival stronghold located on a 150-acre estate southwest of Wexford town in County Wexford, built between 1836 and 1872. The estate encompasses three artificial lakes designed by Victorian architect Daniel Robertson, featuring the 12-acre lower lake and extensive ornamental gardens. The Irish Agricultural Museum occupies the courtyard buildings, displaying rural heritage collections. Notable features include the longest domestic servants' tunnel in Ireland and meticulously restored Victorian gardens, making it a comprehensive heritage destination blending architectural grandeur with historical and natural landscape elements.