North Yorkshire Police say they are investigating reports of anti-social behaviour at Druids Temple near Masham.
Patrols are to be stepped up in a bid to deter people from causing problems at the site.
A force spokesperson said: “The location is one of our county’s beauty spots open to the public with parking areas provided.
“North Yorkshire Police intend to increase patrols in the area and will be attending this location and other beauty spots in order to deter such behaviour.”
Anyone who witnesses any anti-social behaviour in the area of Druids Temple should contact North Yorkshire Police on 101.