You can still visit the casino even if you do not plan to gamble. Monte Carlo Casino is a magnificent, richly decorated building in the Principality of Monaco, and also the main attraction of the Monte Carlo district. It is something you must see while you are in Monaco.
It is mandatory to present a valid national identity card (for EU nationals) or passport with a photograph (driving licences are not accepted). No other items of proof can be accepted to access the gaming rooms.