Far fewer pause to consider what life looked like on the inside of those walls, in the ordinary, daily sense. Excavations in the western half of the fort's inner enclosure uncovered something quietly telling: a large, flat limestone slab, deliberately placed, with a scatter of charcoal and fish bone concentrated along its eastern side. It is the kind of detail that shifts a monument from symbol to inhabited place.

The slab is one of at least four hearths uncovered during research excavations of the inner enclosure, all of them clustered in proximity to a pit and to one another, the nearest pair just 3.4 metres apart. The charcoal and fish bone at the eastern edge of this particular hearth suggest it functioned as a cooking or food preparation surface, though the precise arrangement, a slab rather than a clay-lined hollow or stone-kerbed fireplace, is modest and unelaborate. All four hearths have been dated to the Late Bronze Age, a period broadly running from around 1200 to 600 BC, placing this domestic activity within the early phases of a site whose stone architecture would continue to be used and modified for centuries. The excavations were published by Cotter in 2012, drawing on extensive fieldwork within the enclosure.

What the hearth offers, in the end, is a correction of scale. Dún Aonghasa is usually framed in terms of its walls, its promontory position, its sheer visual drama. A flat limestone slab with fish bones at its edge insists on something smaller: people cooking a meal inside those walls, in the Bronze Age, facing whatever direction kept the wind off the fire.