If a road were desired to take the Romans to a certain place that road would be built. Similarly, the roads of the modern day twentieth century are built when the need for the road is established. However, Roman structures remain the biggest contribution to there era. Some examples of Roman structures of importance are the Theater of Orange, Arch of Triumph of Orange, Spain's Aqueduct of Segovia, Pont du Gard, Porta Nigra of Trier, Imperial Baths of Trier, Hadrians's Wall in England, the Colosseum, the Amphitheater of Arles, and Temple of Vesta.
The Theater of Oranges in France is known for its great rear wall, which is 338 feet long and 125 feet high. The building is almost in its original condition, except for the roof and some decorative columns and statues. The Arch of Triumph of Orange was built in the early reign of Augustus Caesar and was dedicated to Julius Caesar, Augustus" adopted father. It is located north of the city of Orange, on what was once the via Agrippa. The north face of the Arch of Triumph of Oranges is covered with scenes of victory from the campaigns of the second Roman legion. There are also carvings depicting battles between the Gauls and the Romans, prisoners in chains, and naval and military trophies. .
Spain's Aqueduct of Segovia was built of stones with no mortar between them. Mortar is a plastic building material that hardens and is used in masonry or plastering. This famous aqueduct is still functional and is used to carry water in the present day.
The Pont du Gard in France served as both a bridge and an aqueduct. It was divided into three levels. The top level was used for the passage of water over the valley and the bottom level was used for a bridge. Troops could march over this structure in order to get to another location. The bridges dimensions are colossal for the time period.
"This bridge, over the river Gard, is 275 metres (900 feet) long and 49 metres (160 feet) high.