The fortified citadel at Blaye, standing on the opposite bank of the river Gironde to Fort Médoc, forms, along with Fort Paté, the region's 17th-century defence against river attack.
Built by Vauban, together this group are named the Fortifications of Vauban and are classified as a UNESCO World Heritage Site. The site of the citadel saw its first castle in the 7th century. Vauban's fortress though was built in 1689 and took three years.
The largest of the three fortresses, Blaye has both landward and seaward defences with dry ditches dug out of the rock. He incorporated some of the existing defences into his structure to the benefit of the fort. Some elements are still inhabited today. An impressive spot offering a panoramic view.
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.