Paris, France
In the late 1960s what was Paris's primary farmers' market moved out to the suburbs to be replaced by a park above ground, and a sprawling underground shopping centre below. The interior design is strikingly period (think ''Logan's Run''). The place is showing its age now, but still draws nearly a h
alf-million Parisians per day, mostly teenagers. There's a movie theatre and a media library too. Les Halles is undergoing extensive refurbishment until 2016.
Listen to the audio guide for Halles Free on WIP — starts by itself when you arrive, even with the screen off