This was a very important road in Ancient Rome. It was named after a guy called “Appius.”
It was a technologically advanced road for the time (300s BC). It was paved with interlocking stones, and was crowned to run water off to gutters on the sides.
It was about 350 miles long, and in one section, it’s completely straight for 39 miles, which is the longest straight road in all of Europe.
It still exists, in pieces.