North Wales Police have described the damage as 'unbelievable' after reports someone 'smashed part of the round tower' with a hammer
Dolbadarn Castle in Llanberis is located around 12 miles from Bangor.
It is believed to have been constructed by Llywelyn ap Iorwerth in the late 12th or early 13th century.Police received a report from Cadw - the Welsh government's service with responsibility for historic sites - that part of the castle's round tower had been deliberately damaged with a hammer.PCSO Rhys Evans said the"beautiful monument" should"be respected".
In a social media appeal, he said:"Unbelievably, somebody is reported to have climbed up to the top with a hammer and smashed part of the round tower."
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