Killyleagh Castle is a historic castle located in County Down, Northern Ireland. Built in the early 17th century, it is one of the oldest inhabited castles in the country. The castle features a distinctive fairy-tale appearance, with its turrets and stone walls, and is set against the backdrop of the picturesque Strangford Lough. The castle has been home to the Ward family for over 350 years and has undergone various renovations throughout its history. Today, it remains a private residence, but its striking architecture and scenic surroundings make it a notable landmark in the region.