RMS Titanic despite sinking 100 years ago, has a great presence around the world. It would be good to collect all references in their own Category.
All those for the idea say AYE.
Of course the ultimate Waymark would be the wreck site. Tricky.
To qualify an image would have to show the word Titanic or the poster would need a very good excuse why they failed to get a photo of the words RMS Titanic.