Hen Dre'r Mynydd is an Iron Age undefended settlement set in high open moorland with evidence of walled enclosures and houses. The site is north of Treherbert, southwest of Merthyr Tydfil and Aberdare. It is on open moorland near the A4061 Treherbert to Hirwaun road about 4km north of Treherbert.
Image: Hen Dre'r Mynydd image courtesy of BBC Cymru.