What is the Roman Empire famous for?

The Roman Empire, as a huge civilized state that existed for many centuries, was famous for its remarkable achievements in many areas of life:
in legal – the creation of Roman law;
in civil engineering – the construction of walls, Roman roads, aqueducts, canals, the invention of concrete;
in the cultural – the creation of a unified Greco-Roman culture, the most beautiful preserved architectural structures – the Pantheon, the Colosseum and others, the establishment of public libraries, baths;
in the religious – the emergence of Christianity;
in the military – the creation of a powerful professional army with strict discipline, clear hierarchy, well-thought-out tactics, which won many victories that expanded the boundaries of the Roman state.