saltz and jacob collier. that's next time.hen. ♪ ♪ >>> and by contributions to your pbs station from viewers like you. thank you. ♪ ♪ steves: this region's breathtaking coastline is traversed by three coastal routes -- the low, middle, and high corniche. the low corniche strings ports, beaches, and villages together. it was built in the 1860s, along with the train line, to bring people to the casino in nearby monte carlo. the middle corniche comes with views of impressive villas, and the grande corniche caps the cliffs with staggering mediterranean vistas. while hailed as napoleon's crowning road construction achievement, it actually sits upon the via aurelia, a road built by the ancient romans as they conquered the west. a towering roman ruin celebrates that conquest. caesar augustus built the trophy of the alpes to commemorate his defeat of the region's many hostile tribes. with this victory, the completion of the main artery connecting italy and spain was made possible. this opened the way for the continued expansion of the