Perhaps one of the most obvious and most enduring signs of Rome’s legacy lies underfoot in its network of roads that stretch from Scotland to north of the Danube, east to the Crimea and south to the Red Sea.
This article in Atlas Obscura has some fine pictures (including that of the Pont du Gard in Nimes, France pictured above) and highlights some of the more remarkable, and obscure bits of the Romans highway system that still exists across Western Europe, North Africa and the Middle East.
http://www.atlasobscura.com/articles/the-beautiful-network-of-ancient-roman-roads