Vandals are believed to have climbed up scaffolding to get into Castle Cornet last month before drawing offensive graffiti.
Sometime between 17:30 on Friday 16 April and 08:00 the following morning, offensive language and imagery was drawn on a bench, walls, worktops and glass of a greenhouse.
Police believe the offenders had gained entry to the Castle - which was closed at the time - via scaffolding.
Anyone with information or who witnessed the offenders is asked to contact PC95 Jefferies on 222 222 or to contact CrimeStoppers anonymously on 0800 555 111.
Pictured: The scaffolding around Castle Cornet.
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