For this reason, arch bridges must be made of materials that are strong under compression. The Romans used stones. One of the most famous examples of their handiwork is the Pont du Gard aqueduct ...

It was built in 850 B.C. Roman engineers built many arch bridges, quite a few of which are still standing. Probably the most famous is the Pont du Gard, an aqueduct bridge in southern France.

For this reason, arch bridges must be made of materials that are strong under compression. The Pont du Gard aqueduct The Romans used stones. One of the most famous examples of their handiwork is ...