The Roman Theatre in Cartagena was built between 5 and 1 BCE, as has been proven by the dedication of the edifice to Gaius and Lucius Caesar, grandsons of Augustus, who had designated them as his successors.
In the 3rd century a market was built over the theatre, reusing its materials, with a semicircular open space which followed the plan of the orchestra. The market was perhaps abandoned after a fire caused by the Vandals in 425. A market quarter of the Byzantines was established on the site in the 6th century.
During the 13th century the Old Cathedral of the city was built over the upper cavea. In 1988 the first remains of the theatre were discovered during the construction of the Centro regional de artesanía. The archaeological excavations and the restorations were completed in 2003. In 2008 a museum, designed by Rafael Moneo, was opened.
The cavea was carved directly on the rocks in its central part, and tops a series of vaulted galleries. It had a capacity of some 6,000 spectators. It was divided horizontally in three parts (ima, media and summa cavea), in turn divided into radial sectors by the staircases (five in the upper part, seven in the medium and upper ones).
The public entered from two side passages (aditus), where the dedications have been found. The orchestra had a semicircular plan and housed three rows of wooden seats for the authorities (proedria). The stage (proscaenium) had a length of 43.60 m. The scaenae frons had three semicircular exedras and decorated by two orders of columns, with bases and capitals in Luni's marble, and shaft in pink travertine of Mula. The stage edifice had a total height of 14.60 m. It have been found three round altars dedicated to the Capituline Triad and to the divinities of Apollo (Graces, Muses and Horae), as well as a statue of Apollo with lyre and one of Rhea Silvia.
Behind the stage building was a portico (porticus post scaenam) with a double porticoed gallery revolving around a central room housing a garden.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.