O'Molloy Castle is a historic structure located in County Offaly, Ireland. Built in the 15th century, it served as a stronghold for the O'Molloy family, who were prominent local chieftains. The castle features typical medieval architecture, including thick stone walls and narrow windows, designed for defense. Today, O'Molloy Castle is a ruin, but it remains an important site for understanding Irish history and the feudal system. The castle's remnants attract visitors interested in Irish heritage and the stories of the families that once inhabited it.