The tunnels leading to the Paris catacombs are covered with urban style graffiti, and cozy cafes located by the former railway stations heartily welcome travelers for a coffee break. The most delightful spectacle is available during the spring months when the railway valleys are entirely overtaken by bright spring blossoms. This railway is named the Chemin de fer de Petite Ceinture, literally meaning "little belt railway." It was built in the mid-19th century and abandoned around a hundred years later for the newly-emerged Paris Metro and growing number of motor vehicles. Though as you see even in its non-functioning state the railway enjoys great popularity among travelers seeking unusual places.