Roman remains

• The Triumphal Arch of the Tetrarchy at the entrance to the city commemorates the four emperors that governed the empire in the year 300, just before the rule of Constantine the Great
• The Public Baths
• The Forum, one of the best preserved in the world
• The Gate of Antoninus, which stands at the entrance to the forum and can be dated between 138 and 161. Its inscriptions make reference to Antoninus Pius and his two adopted sons, Lucius Verus and Marcus Aurelius
• The three temples. Instead of constructing only one temple dedicated to the three most important Roman gods (Jupiter, Juno, and Minerva), the inhabitants of the city built separate temples for each one. A similar arrangement is also found at Baelo Claudia in Spain.
• Other important buildings include the theater and the public fountains.

Byzantine remains

The majority of the Byzantine buildings stand on the foundations and incorporate elements of earlier Roman ones. They include:

• The Basilica of Bellator (late 4th or early 5th century), named for a local bishop^[3] and including
  • The Chapel of Jucundus, which served as a baptistery and was named for an early 5th-century bishop buried there^[3]
• The Basilica of Vitalis (5th-6th century), named for its founding presbyter. A basin predating the church and decorated by a fish mosaic was found under the floor of its nave.^[3][4]
• The Church of Servus (5th century), named for its presbyter^[3]
• The Church of Saints Gervase, Protase, and Tryphon