It really is amazing what the Romans built that is STILL standing today; their roads are one of the more famous examples and (because we’re on the subject of roads) there are some ancient New-World roads which extend virtually laser-straight for miles and nobody knows how they were able to do it.
I was amazed when visiting England three years ago at all the old churches many of which are at least one thousand years old. And look as strong as ever. When visiting the city my wife grew up in, Norwich, she pointed out an old stone wall built by the Romans. I was absolutely awed looking at something someone had built two thousand years ago and was still standing. Nothing like that in America.