Rent a bike and cycle to the museum of Electricity, near to the zoo.
A knock on the door and several minutes later it's opened by dishevelled caretaker. It's all a little unpromising, but head to the rear hall and you're met by the sight of enormous generators, weird cars, bikes, street-lamps, enough to distract you from the fact you're in an electricity museum.
A great find, and an offbeat excursion for a morning away from the red-light hustle.
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