Bosigran Castle is an Iron Age promontory fort perched dramatically on the cliffs of Far West Cornwall near Penzance. The site is defended by a distinctive thick stone wall running 120 meters long with a central entrance, constructed without external ditches. Unusually well-preserved for its type, the fort overlooks the unspoiled Bosigran Cove and offers breathtaking coastal views. The challenging coastal path leads past the historic Carn Galver engine house, where visitors may spot seals along the rocky shoreline. The site reflects Iron Age settlement patterns from roughly the 6th century BC to the mid-1st century AD.