Plaquette in Norwegian. The Norwegian WW2 resistance hiding place for weapons in the Langlivannet dam in Nordmarka.
<a href="//commons.wikimedia.org/wiki/User:Keanu4" title="User:Keanu4">Keanu4</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>