Rumster Broch (Forse)
A grassy mound holds the ruins of the broch, and there is nothing to see as it's all underground. Earlier field trips mentioned an exposed wall face in a couple of places, but they're overgrown now because I couldn't find them.
Take the track from the A9 at Forse. It's easy walking, but if you take in the Golsary broch at the same time, quite a lengthy one.
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Disclaimer: Some brochs were built with military defensive purpose, and as such can be situated in extremely dangerous areas, such as on the edge of cliffs and ravines. Additionally, these are Iron Age structures, most of them in ruins, and they are extremely hazardous, with crumbling stone walls and hidden chambers. Existing walls, lintels, and passages could collapse at any time. The information here is provided free but it is your responsibility to ensure its accuracy, ensure your own safety, and acquire permissions for access where necessary. Accessing brochs is done entirely at your own risk.