Châtelet-Les Halles RER Station a Parigi

Châtelet-Les Halles RER Station opened in 1977 and has become one of the busiest subterranean stations in the world. It’s the main intersection of Paris metro and RER lines, which link the city center to other neighborhoods and suburbs. Although visitors are more prone to get lost, even native Parisians frequently struggle to find the correct exit and usually choose the first one they see.