The greatest bridge builders of antiquity were the ancient Romans. The Romans built arch bridges and aqueducts that could stand in conditions that would damage or destroy earlier designs, some of which still stand today. An example is the Alcántara Bridge, built over the river Tagus, in Spain. The Romans also used cement, which reduced the variation of strength found in natural stone. One type of cement, called pozzolana, consisted of water, lime, sand, and volcanic rock. Brick and mortar bridges were built after the Roman era, as the technology for cement was lost (then later rediscovered).
the greatest bridge builders of antiquity were the ancient romans the romans built arch bridges and aqueducts that could stand in conditions that would damage or destroy earlier designs some of which still stand today an example is the alcántara bridge built over the river tagus in spain the romans also used cement which reduced the variation of strength found in natural stone one type of cement called pozzolana consisted of water lime sand and volcanic rock brick and mortar bridges were built after the roman era as the technology for cement was lost (then later rediscovered)