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The fortress sprawls over a huge area making it the largest castle in Wales. Like the famous cheese, the castle has long been synonymous with Caerphilly. It dominates. Hogs the limelight. Think slumbering giant awaiting a call to arms. It's also a great backdrop for TV and film. It secured a starring role recently in the popular BBC TV series Merlin. The displayed opening times are our general pattern. Please check the Cadw website for specific times and days, including closures.