During the 19th century, Paris was the home and subject for some of France's greatest writers, including Charles Baudelaire, Stéphane Mallarmé, Mérimée, Alfred de Musset, Marcel Proust, Émile Zola, Alexandre Dumas, Gustave Flaubert, Guy de Maupassant and Honoré de Balzac. Where did Jules Verne do research for his stories?