Police are urging people to respect the Island's national heritage sites so they're protected for generations to come.
It follows damage reported by Manx National Heritage over the last few weeks at three sites.
People have been lighting fires and at Cashtal Yn Ard someone has defaced the ancient stones with imprints of naked women.
Police say scene of crime officers have been to one of the sites and obtained evidence that may lead to the people responsible.
They say the sites are what make our countryside 'unique'.
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