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Photo: Vincent Desjardins, CC BY 2.0 via Wikimedia Commons
Try to visit the cabinet des Médailles.
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National Opéra Comic Theatre
The théâtre national de l'Opéra-Comique (National Opéra Comic Theatre) is an opera company and opera house.
One of the last remnants of medieval Paris outside of the 4th, this tower was once part of a castle called l'hôtel de Bourgogne.