Bryn Cader Faner is a Bronze Age round cairn which lies to the east of the small hamlet of Talsarnau in the Ardudwy area of Gwynedd in Wales. The diameter is 8.7 metres and there are 18 thin jagged pillars which jut upwards from the low cairn. It is thought to date back to the late third millennium BC. The site was disturbed by 19th century treasure-seekers, who left a hole in the center indicating the position of a cist or a grave. Originally there may have been about 30 pillars, each some 2 metres long. Unfortunately before the Second World War, the army removed some stones on the east side.