Tulloch of Achavarn Broch (Loch Calder)
A rather uninteresting grassy mound is all that's left, which is easy to miss if you didn't know there was a broch there. The broch has been completely quarried for its stone and there is nothing left. However, they're all important, and visiting these sites can give you insights into how the Picts lived and how they defeated the Romans. Easiest access may be through the nearby farm and asking for access, otherwise barbed wire fences and rough ground await to assail you.
Reproduced by permission of Ordnance Survey on behalf of HMSO. © Crown Copyright. All rights reserved.
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.