Roman Empire by Train with Alice Roberts season 1 episode 4
Episode title: The Streets of Turin
In the city of Parma, Alice surveys an underground hotel, a buried Roman bridge and a museum of offerings to the gods. A train takes Alice north to Turin, to find out how the city's grid system helped scientists crack an age-old mystery. She also heads across the Alps to discover how Hannibal dragged his army of elephants through the mountains.
