If you are entering from Switzerland you don't need any more ID's. If you manage to get into the actual station underground then I think you need one. Not sure. @lemouth can enlighten you
You indeed only need a valid ID (with the necessary visa to enter Switzerland and France). You can enter without any problem for the public exhibitions. For the rest, you need to plan the visit a little bit in advance and queue with the rest of the world.
If you are entering from Switzerland you don't need any more ID's. If you manage to get into the actual station underground then I think you need one. Not sure. @lemouth can enlighten you
You indeed only need a valid ID (with the necessary visa to enter Switzerland and France). You can enter without any problem for the public exhibitions. For the rest, you need to plan the visit a little bit in advance and queue with the rest of the world.