Baptistery of Saint-Sauveur
Although mostly reconstructed, the interior of the baptistery reveals the influence of Roman architecture on Merovingian architects.
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https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/Baptistere_Saint_Sauveur_by_Malost.JPG/360px-Baptistere_Saint_Sauveur_by_Malost.JPG
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