Tomen y Mur
Near Trawsfynydd, Gwynedd
Tomen y Mur was a Roman fort high on the moors of Snowdonia, with a bath house, parade ground and Britain's most remote amphitheatre, perhaps used for training. Centuries later the Normans built a castle mound inside it.
Read the full story, see it on the map, get directions and find what else is nearby in the free Hidden Britain Atlas map.
- When
- About AD 78
- Where
- 52.9400, -3.9200
- Group
- Roman Britain
Visiting
Free, reached by a minor road off the A470.

The Ledger of Lost Britain
The Romans arrived in AD 43. For most people that is where the history of Britain begins. But by the time the legions landed, people had already been living on these islands for thousands of years. They had hunted, farmed, mined flint, dragged stones across the country, raised a hill by hand, and buried their dead in great tombs. They left no written words. What they left was the ground itself. Every place in this book can be visited, or has been dug up, or is in a museum.
Nearby mysteries
- The Trawsfynydd TankardLost treasure · Trawsfynydd, Gwynedd · 3 miles away
- Manod QuarrySecret site · Near Blaenau Ffestiniog, Gwynedd · 3 miles away
- CwmorthinLost village · Near Blaenau Ffestiniog, Gwynedd · 4 miles away
- Llechwedd Slate CavernsCave or grotto · Blaenau Ffestiniog, Gwynedd · 4 miles away
- Llech IdrisHill figure · Near Trawsfynydd, Gwynedd · 4 miles away
- The Gwiber of PenmachnoDragon or monster · Penmachno, Conwy · 8 miles away