The Bridge of Prado (Ponte do Prado) over the Cávado River was originally a Roman bridge. It was re-constructed during the 16th century when the original had been destroyed following flooding and consistent use. There are few vestiges of the Roman bridge.
The bridge's exit (to the north) fronts the Praça do Conselheiro Sousa Lima, a gardened area, the site of a 16th-century pillory marking Prado's historical importance as a municipality until the 19th century.
The flat-top shallow cantilever bridge consists of nine Roman arches that progressively increase in size the closer to the centre of the span, with the three largest arches slightly peaked. Eight triangular abutments protect the base of the bridge from debris, while polygonal structures downstream act as reinforcements.
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.