A dramatic Iron Age cliff fort on a south-pointing headland between Porthcurno and Penberth in Cornwall.
The landward side is defended by three pairs of ramparts and ditches, and these are still impressive. The headland has a very narrow neck, and this is defended by a ditch and stone wall. Nearby are traces of roundhouses.
Coastal views from the cliff fort are outstanding.
Most visitors to ths granite headland come to see the "Logan Rock", an 80 tonne loganstone that was dislodged by a naval lieutenant in 1824 and subsequently replaced at great expense.
Access Car park in a field at Treen (SW395230) and a clearly signposted path south across arable fields to the headland. Exploring the headland will involve steep climbing, and could be dangerous during windy/wet weather because it is so exposed.
The great rock castle of Treryn Dinas juts out to the east of Porthcurno. At its end sits the famous Logan Rock, a rectangular block of granite which weighs about 70 tons, and which can be rocked back and forth by one person. Stones such as this are common in Cornwall and result from the way the granite weathers and cracks to leave huge monoliths perched on top of each other. The Logan Rock was, famously, pushed off in 1824 but was replaced soon after.
On the way out to the Logan Rock, just before the grassy slope that leads to the promontory, there is a bank of earth. This is part of a great earthwork, a double bank and a ditch which extends in an arc for several hundred feet. This was an Iron Age fortification, hence the name ‘Dinas’ which means castle.
Once you have explored Treryn Dinas and the Logan Rock, return to Porthcurno via the Logan Rock Inn at Treen, the coastal path, or the public footpath across the fields which brings you back to the lane adjacent to the museum.