Saint-Martin, Paris
The Saint-Martin station, along with a number of others, closed in Paris after World War II because of its proximity to other stations. They are known as Paris' "ghost" metro stations. The Salvation Army has turned many of the "ghost" stations into a refuge for homeless people that need shelter. Check out these abandoned castles around the world.
9 Photos of Abandoned Subway Stations Around the World, Source:https://www.rd.com/list/abandoned-subway-station-photos/