Rathfarnham Castle is a historic structure located in Dublin, Ireland. Built in the late 16th century, it was originally constructed as a fortified residence for the Archbishop of Dublin. The castle features a distinctive round tower and is surrounded by beautiful gardens, making it a notable landmark in the area. In the 19th century, the castle underwent significant renovations, transforming it into a more comfortable residence. Today, Rathfarnham Castle is managed by Dublin City Council and is open to the public, offering guided tours that highlight its rich history and architectural significance.