A huge Iron Age roundhouse, thought to be about 2,500 years old, and roman pottery have been uncovered during an archaeological dig at a coastal fort.
Volunteers have joined experts to find out more about the little-known Dinas Dinlle National Trust-owned monument in Gwynedd before it falls into the sea.
The 43ft (13m) wide roundhouse was buried by coastal sand, thought to have blown there during a sandstorm in 1330.
Coins found at the fort near Caernarfon suggest it was occupied in Roman times.
The “well-preserved” roundhouse – with its 8ft (2.5m) thick walls – was uncovered close to the cliff edge buried underneath 3ft (1m) of sand during a two-week dig.