The existence of the Fort Risban was first mentioned when it was besieged by the English in November 1346. Edward III of England's troops, finding the defences of Calais impenetrable, decided to erect a small fort to prevent any supplies reaching the town by sea, with a view to starving the inhabitants into submission. Under the English occupation the wooden tower was replaced by a stone structure, the Stone Tower, after 1400 renamed Lancaster Tower, a name often given to the fort itself.
Fort Risban was used by the English forces until 1558 when Calais was restored to France. In 1596, the fort was captured by the Spanish until May 1598 when it was returned to the French following the Treaty of Vervins. It was rebuilt in 1640. Vauban, who visited the fort some time in the 1680s, described it as 'a home for owls, and place to hold the Sabbath' rather than a fortification and let the fortress be altered. In the 19th century the Engineers Corps altered it again. The sea-fortress was dismantled in 1908 but fortified again during World War II when it served as an air raid shelter.
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.