Blackrock Castle formerly Mahon Castle, is a 16th century castle located in Cork city, Ireland. In the late 16th century, the citizens of Cork appealed to Queen Elizabeth I to construct a fort at Blackrock to "repel pirates and other invaders". In or around 1600, a round tower was constructed to safeguard against pirates "carrying away" vessels entering the harbour.
Ludlow Castle courtyard including the round Chapel, Shropshire, England, UK. Ludlow Castle is a ruined medieval fortification in the town of the same name in the English county of Shropshire, standing on a promontory overlooking the River Teme.