TIL the famous grand staircase of the Titanic has no known photos; and that the pictures that depict it are actually of the RMS Olympic's grand staircase, as they are hypothesized to be similar.

https://en.wikipedia.org/wiki/Grand_Staircase_of_the_Titanic#:~:text=Artifacts%20from%20the%20Titanic%20and%20Olympic's%20staircases,-Some%20pieces%20from&text=There%20are%20no%20known%20photograp…

https://www.reddit.com/r/todayilearned/comments/150wtxh/til_the_famous_grand_staircase_of_the_titanic_has/