The curtain wall of the fort encompassed an area of approximately 300 by 130 feet. At the east end was a two-story keep connected to a gatehouse. On the west end was a D-shaped tower that afforded a lookout over the most accessible approach up the hillside. There were also a two-story hall, where the lord would have had hosted banquets.
The hilltop was an important defensive site long before the medieval era. The earthworks below the ruins date from the iron age, indeed, "dinas" is an ancient term for hillfort.
The climb up the hill is steep, and even more challenging if, like me, you miss the marked pathway and end up bushwacking through the dense bracken.