The destruction of the cultural property in conflict zones around the world has captured international attention on the need to prevent its destruction and prosecute those responsible. This article examines the current legal protection and international criminal framework on the criminalisation of the destruction of cultural property and in particular the exception to such destruction amounting to a war crime where they have become military objectives. This article discusses the recent decision in the Prlić et al. case involving the Mostar bridge, in light of its being justified to be attacked as a military objective. This article argues that considerations of proportionality are still required in such circumstances. This is vital to minimise the cost to communities and peoples whose cultural identity is bound up with such cultural objects. The article also suggests that the perfidious use of cultural property by parties to a conflict should be criminalised.