Pull back drone aerial reverse reveal St Catherine's Castle Fowey Cornwall UK

henry viii coastal defense artillery fort historic monument river fowey tudor architecture coastal views twogun battery lookout tower victorian modifications stone ramparts english heritage site invasion fears cannon platforms readymoney cove footpath access historical landmark defensive walls 19thcentury additions napoleonic wars overlooking harbor archaeological significance fowey estuary military history stone construction guided tours heritage preservation strategic location coastal heritage historic fortifications sea defenses thick walls guard rooms drone aerial fowey rugged coast cliffs waves