The early eighteenth-century drawing of Dun Troddan matters because it preserves the lost upper architecture: the parapet, the full taper of the wall, the way the broch silhouette met the sky. The artist saw something that nobody has seen since. Whether the same stone-robbing that gutted Dun Telve in 1722 also damaged Dun Troddan is not entirely clear, but the broch was certainly reduced significantly during the eighteenth century, and the sketch captures it just before that loss. Today only the lower portion of the wall stands - enough to show all the structural principles, but not the soaring upward sweep that made eighteenth-century visitors stop and stare. The drawing remains, hanging in archives in Edinburgh, the record of a building that briefly straddled prehistory and the Enlightenment.

The central court of Dun Troddan is almost a perfect circle, 8.56 metres across. Built into the floor of the hearth is a broken quern-stone - a heavy disc of rock used for grinding grain by hand - that someone, two millennia ago, recycled into part of the fireplace rather than leaving it whole. The wall is hollow-faced like all brochs: two concentric drystone shells with an intramural void. An internal doorway in the surviving high section opens onto a stairway, and nine stairs lead up to a first-floor landing 5.7 metres long, set 2.4 metres above the central court. At the end of the landing the first step of the next flight is still visible, where the stair would have continued upward to higher floors. The whole thing is held together by gravity, friction, and the careful selection of stones whose weight stabilised what came below.

Dun Troddan stands on a level rock platform north of the Abhainn a' Ghlinne Bhig, on a steeper slope than its neighbour - reached by a short, sharp footpath up from the road. Dun Telve lies 470 metres west, easy walking distance, and the semi-broch Dun Grugaig sits roughly two kilometres southeast in the upper part of the same valley. Three Iron Age monuments within a small Highland glen suggests something more than ordinary settlement - probably a clustering of elite or fortified dwellings, possibly belonging to one extended community, possibly competing or related households. Whatever the original social arrangement, the brochs were clearly meant to be seen by each other and by anyone approaching from the coast or down the valley from the east.

Modern visitors usually walk up from the small parking area on the single-track road through Gleann Beag, see Dun Telve first because it sits right beside the verge, then trek the few hundred metres uphill to Dun Troddan. The site is exposed; the wind off the Sound of Sleat funnels up the valley and through the broken wall. Inside, the curved drystone bowl feels like an amphitheatre. Standing in the middle of the central court and looking up at the surviving wall, you can imagine the original timber upper floors, the smoke from the hearth rising, the noise of children and dogs and grinding querns. The view from the entrance, southeast down Gleann Beag, has not changed in any meaningful way for two thousand years - which is, when you think about it, an almost unique kind of preservation.