A Roman home or trading post is being excavated at Tai Cochion near the village of Brynsiencyn.
Dave Hopewell, senior archaeologist, said: "Over 15 volunteers have joined Gwynedd Archaeology Trust staff to excavate the Roman settlement in Brynsiencyn during the last three weeks. This excavation was made possible due to funding from CADW.
The excavation is to be the subject of a TV programme which will be screened on S4C in November.
Read in full: Excavation of Roman site near Brynsiencyn