The director of the Bodelwyddan Castle Trust has told ITV News that he "can't find words to describe" the act of vandalism that's left more than 1,000 bees dead.
Dr Kevin Mason said that he doesn't "know how people can do something like this."
The nine hives were in an orchard at Bodelwyddan Castle.
It's believed the damage was done between April 9 and April 18.
North Wales Police are investigating after more than 1,000 bees were killed and nine hives damaged at the Bodelwyddan Castle Orchard.
But officers believe that the vandals would have suffered stings during the raid.
It's believed the damage was done between midday on 9 April and 18 April.
North Wales Police are asking anyone with information to contact the Investigation Support Team on 101, quoting reference number RC13059506 or Crimestoppers anonymously on 0800 555 111.
One of Wales' grandest country houses hides a secret - it also has one of Wales' strangest war relics.
The grounds of Bodelwyddan Castle in North Wales were once used by troops in the First World War. They built a series of practice trenches to prepare thousands of men for life in the front line.
Rob Shelley went to see a unique reminder of a conflict that is nearing its centenary.