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![Map instructions](https://www.nationaltrail.co.uk/app/themes/egwt/assets/images/map/map_instructions.png)
Straddle the border on this walk of wonders. Offa’s engineers took a short cut to meet their King’s demands, marking the mineral wealth of Llanymynech as Mercian by building on the ramparts of a much earlier and massive Iron Age fort. The Romans were first to mine here, pre-dating Offa’s engineers by some margin. But Victorian engineering surpassed them all, cutting these steep cliffs and building canals and railways to remove their spoils.