The l'île de Ré, opposite La Rochelle, was subjected on several occasions to attack from British soldiers. Conscious of the need to protect access to La Rochelle and Rochefort, in 1681 Vauban started strengthening the island's defences by building a citadel and fortified castle at Saint-Martin-de-Ré, on the North coast.
Built on the site of a fortress where construction work had started in 1627, the square-shaped citadel occupies the eastern part of the town. Its defensive system comprises four bastions, three demi-lunes and a counterguard, surrounded by a moat and a covered walkway. It contained an arsenal, food and powder stores, barracks and officers' accommodation. The citadel opens on to the sea via a small fortified port. From 1873 onwards it became a stop-off point for penal colony prisoners on the way to New Caledonia until 1897 and later to Guyana until 1938. Today it remains a prison for more than 400 detainees and is not open to the public.
An example of Vauban's first system adapted to suit a flat site, the construction was accompanied by an enormous fortified enclosure capable of accommodating the island's population of some 16,000 inhabitants, as well as their livestock, and of storing food supplies and forage in the event of enemy attack. In an arc on the land side, there are bastions, orilloned half- bastions and a counterguard. Two monumental gates, the Porte Toiras and the Porte des Campani form the access points. Also surrounded by a moat and a covered walkway, it is in addition encircled by an open-plan glacis, sloping outwards from the ramparts within canon-firing range.
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.