Archaeologist Stuart Mendelsohn spotted two sites near the moors of Rochdale, believed to be ancient burial sites, during a walk on the hills in December.

English Heritage claimed that both sites were "possible of Bronze age date", suggesting that they could date back to 3,000 BC.

However, unlike the famous monument at Stonehenge, local materials are believed to have been used at the newly discovered sites.

The first site, made up of fallen stones, is 10.2m in overall diameter. The second, which includes the circle, is on the western slope.

The entire site covers an acre, according to an English Heritage report.