The Château de Gavaudun on the river Lède. It was built on a rocky spur and overhangs the river. The lofty 13th century keep rises 25m above the level of the rock. The castle was built during the 12th and the 13th centuries, on the main road between Périgord and Agenais. The bishop of Périgueux besieged it and destroyed it for the first time in 1165.
During the Hundred Years' War it was of central importance in the conflict between England and France. In the 15th century, the castle changed families through a marriage. It was recovered by the town of Gavaudun in 1796 in poor condition. Today, the donjon tower of the castle has been protected and listed since 1862.
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.