The Flavian dynasty of Vespasian, Titus, and Domitian. Vespasian linked himself to Divus Claudius by completing the Claudianum, distanced himself from Nero by destroying part of the Domus Aurea, filling in the artificial lake and replacing it with the Colosseum. Titus commissioned Rome's first preserved example of the "imperial bath type," characterized by grand scale, axiality, and symmetry.

Trajan’s monumental architecture in Rome references his expansion of the Roman Empire to its furthest reaches. Highlights include the Baths of Trajan and the Forum and Markets of Trajan, built on land that engineer/architect Apollodorus of Damascus created by cutting away part of the Quirinal Hill. The complex also includes the celebrated 125-foot Column of Trajan with a spiral frieze commemorating the emperor's military victories in Dacia.

Architecture in and around Rome during Hadrian’s reign: the Temple of Venus and Roma possibly designed by Hadrian; the Pantheon, combining the marble porch and pediment of a traditional Greco-Roman temple with a vast concrete cylindrical drum, hemispherical dome, central oculus, and theatrical light effects; the Villa of Hadrian at Tivoli, where the emperor recreated buildings and works of art observed during his empire-wide travels; and the Mausoleum of Hadrian (Castel Sant'Angelo).

Exploration of a "bigger is better" philosophy; exposed brick tombs with painted stucco and architectural elements; the Temple of Divine Antoninus Pius and Faustina and its post-antique afterlife as the Church of S. Lorenzo in Miranda; the earliest surviving triple-bayed Arch of Septimius Severus in the Roman Forum; the Septizodium, a lively baroque-style façade for Domitian's Palace on the Palatine Hill; and the colossal Baths of Caracalla

Timgad, Trajan’s colony for Roman army veterans, was designed as a castrum; Leptis Magna, with Carthaginian roots, was developed first under Augustus. Leptis-born Septimius Severus renovated his hometown featuring a forum, basilica, and arch. Entrepreneurs, providing animals to Rome's amphitheaters, commissioned Hunting Baths with intimate vaulted spaces revealed on the outside and silhouetted against the sea, suggesting that they knew how to innovate and enjoy life.

The rebirth of Athens under Rome’s foremost philhellenic emperors, Augustus and Hadrian. High quality Greek marble and expert Greek stone carvers produced notable edifices in Roman Greece dependent on a mutual exchange of architectural ideas and motifs between Rome and Athens. These include the Monument of Philopappos, the Library and Arch of Hadrian, and architectural additions or transformations made to the Acropolis and the Greek and Roman Agoras.

Except for the Aurelian Walls, Rome’s third century was an "architectural wasteland.” Diocletian created a new form of government called the Tetrarchy (four-man rule) with leaders in East and West. Public and private building campaigns in Rome and the provinces reflected the Empire's renewed stability and centered on enhancing or restoring buildings in the Roman Forum and constructing the Baths of Diocletian in Rome and Diocletian’s Palace at Split.