The Pigalle reference article from the English Wikipedia on 24-Apr-2004
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Pigalle

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Pigalle is the name of an area in Paris, France around Place Pigalle (a plaza). It is famous for being a touristic red-light district, with many sex shops on Place Pigalle and the main boulevards and prostitutes operating in the side streets.

Pigalle also comprises several major spectacle halls:

Despite the activity going on, the area is actually quite safe and lively at night. It is a well known spot for tourists who want to experience "Paris by night".