4. Arsenal

Arsenal Metro-Abandoned-Entrance-Quai-Seine-BastilleImage by ZeMeilleur via Wikimedia Commons

Along the 5 line is this decommissioned metro station, closed since September 2, 1939 when the last trained called here. According to Urban Ghosts, “Arsenal was one of several subway stations in the city to close due to the mobilization of CMP employees at the start of World War Two.” Such stations were deemed non-essential due to their proximity to other stations.

Today the only sign of this former subway station is this blocked off entrance along the Seine, between Bastille and Quai de la Rapée: