The Milvian (or Mulvian) Bridge was an economically and strategically important bridge in the era of the Roman Empire and was the site of the famous Battle of the Milvian Bridge.
A bridge was built by consul Gaius Claudius Nero in 206 BC after he had defeated the Carthaginian army in the Battle of the Metaurus. In 115 BC, consul Marcus Aemilius Scaurus built a new bridge of stone in the same position, demolishing the old one. In 63 BC, letters from the conspirators of the Catiline conspiracy were intercepted here, allowing Cicero to read them to the Roman Senate the next day.
In AD 312, Constantine I defeated his stronger rival Maxentius between this bridge and Saxa Rubra, in the famous Battle of the Milvian Bridge.
During the Middle Ages, the bridge was renovated by a monk named Acuzio, and in 1429 Pope Martin V asked a famous architect, Francesco da Genazzano, to repair it because it was collapsing. During the 18th and 19th centuries, the bridge was modified by two architects, Giuseppe Valadier and Domenico Pigiani.
The bridge was badly damaged in 1849 by Garibaldi's troops, in an attempt to block a French invasion, and later repaired by Pope Pius IX in 1850.
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.