This time, we are at metro station Les Halles in central Paris. We will discover the story of the famous Halles market and we will visit the underground city that has replaced it. We will meet a few little ''monsters'', some local merchants and visit historic and religious sites. We will also take this opportunity to enjoy a meal at a good restaurant. Les Halles is an area that has experienced major changes over its history... and by no means is it done evolving.