Rosse Castle is a historic structure located in County Offaly, Ireland. Built in the 16th century, it was originally constructed as a defensive fortress by the O'Molloy family. The castle features a distinctive round tower and is surrounded by scenic landscapes, making it a notable landmark in the area. Today, Rosse Castle is a popular site for visitors interested in Irish history and architecture. Although it is in ruins, the castle's remnants provide insight into the past and the strategic importance of such fortifications during its time. The site is often included in local heritage tours.