He mentions 4 works of the different types of Roman civil architecture and comments on their most outstanding features
1. Thermal baths: Architectural construction consisting of public baths. They consisted of the following parts: cold baths (frigidarium), tempered baths (tepidarium), steam baths (caldarium), rooms for stripping (apodyterium and other rooms. They were also meeting places. The most famous are those of Caracalla in Rome.
Basilica: It was a rectangular room, divided into three or five naves by columns, ending in a semicircular apse and serving as a court and trading bag. It was located in the forum. It served as a model for the Christian church.
3. Amphitheater: Public building for shows (fights between gladiators and animals). It has an oval floor plan with steps (cavea) around the sand where the fighting took place. The most famous is the Colosseum of Rome (1st century), built by the emperors Flavios (Vespasian and his son Titus). It has a capacity for 50,000 spectators.
4. Triumphal Arch: Monument commemorating Roman military victories. It consisted of one or more spans between solid pillars. The second body, called the attic, bears inscriptions. Those of Titus and Constantine in the Forum of Rome are very famous.