More than 100 pagans joined a fight against proposals to extend quarrying at a historic site in North Yorkshire.
Opponents say the plans threaten the 'Stonehenge of the North'
Tarmac Northern wants to extend its present operations close to the Thornborough Henges ancient earthworks near Ripon.
The druids met at the site to mark the May Day ritual of Beltane, a pagan celebration of the height of spring.
Local archaeologists also joined the protest. The group claims the Henges are under threat from the quarrying.
The area has the greatest concentration of late Neolithic and early Bronze Age sites in the UK.
It also boasts the country's largest quarrying operation on prehistoric land, Nosterfield Quarry, which produces more than 500,000 tonnes of sand and gravel each year.
The firm says it is not seeking to quarry on the earthworks which form the three 5,000-year-old circles which may have been a ceremonial meeting place.