We saw in The Painter in Modern Life the counterpart –especially in the flâneur, the city walker and observer– of H. D. Thoreau's Walking. Both texts are almost contemporary –they were published in the same decade, one in France and the other in the United States– and although they belong to different species of walkers, they follow parallel but close paths. Thoreau's walker observes nature, Baudelaire's the city. Front and back.