The empire known for its extensive road system was the Roman Empire. At its height, the Roman Empire spanned three continents—Europe, Africa, and Asia—and developed a complex, well-engineered network of roads that facilitated trade, military movement, and communication across vast distances. Roman roads were constructed using layers of materials for durability and proper drainage, significantly advancing engineering techniques of the time. The famous saying "All roads lead to Rome" reflects the centrality of this system in connecting various parts of the empire. Roman roads played an essential role in the cultural and economic integration of the territories under Roman control.