Spolia (fragments of buildings or works of art) in <a href="https://en.wikipedia.org/wiki/Malbork_Castle" class="extiw" title="en:Malbork Castle">en:Malbork Castle</a>
myself (<a href="//commons.wikimedia.org/wiki/User:Piotrus" title="User:Piotrus">User:Piotrus</a>)
CC BY-SA 3.0
<span class="int-own-work">Self-photographed</span>