Police have stepped up patrols after reports of anti-social behaviour at Newstead Abbey.
Staff at the tourist hotspot have reported receiving verbal abuse and encountering aggressive behaviour from members of the public who have refused to pay to enter the grounds over the past few days.
Beer bottles and litter have been left all over the grounds by those paying a visit to the park to soak up the sun.
Officers have also received an increase in complaints about off-road and unlicensed motorbikes speeding through the Abbey grounds.
Following the complaints, officers from Operation Reacher will now step up patrols in a bid to curb bad behaviour at the site.
A spokesman said: “We spent yesterday afternoon and evening in the abbey grounds and surrounding villages and we will be again after receiving complaints from staff and residents at Newstead Abbey regarding these incidents.
“People refusing to pay on entry becoming verbally abusive and aggressive towards staff at the Abbey is absolutely unacceptable and where offences are alleged the suspects will be dealt with appropriately.
“This space is being provided for us all to enjoy so please be sensible.”