I'm assuming this is an abandoned entrance to the subway inside the gated courtyard to the Palais de Justice. It could be just a tunnel to the other side of the street or something else entirely, but the lamps over the entrance look like the same lamps they used at the current working entrance to the nearby Cité metro stop.
The mood is perfect for that ghost entrance.There are at least 5 or 6 metro stations not used anymore. Sometime when you are in the metro you can see these desolated places as you pass them. I'm positive you can get an authorisation from RATP to go and shoot. You will see adds from the 40's or 50's etc...