Manx National Heritage is appealing for witnesses to come forward after one of the Island's most historic sites was vandalised.
Windows were broken in a building next to Speaker's Garden at Castle Rushen in Castletown.
Repair work means the garden will have to be shut from tomorrow.
MNH says the incident has been reported to police, and the damage takes vital funds away from other heritage sites.
Well-known farm in the west up for sale
Pet foodbank needs your help!
How much cash can government raise in 10 days, asks MHK
LegCo considers meeting on a different day
Extra promenade bus facilities would cost estimated £735k
Medieval cross returned home to Royal Chapel
Arbory MHKs in "parasite politicians" spat
Tyson Fury's boxing glove sold for £7k in charity auction