Dating from c. 4600 BC at the earliest, Le Petit Mont is one of the most significant Cairns in Brittany, but unfortunately one of the most brutaly vandalized. The cairn measures 60 meters in length, 46 meters in width, and between 6 and 7 meters in height. It is built over several dolmens with antechambers. The dolmen in the southwest has engravings that include axes in circles, fitted axes, and undulating signs. The Romans transformed the site into a sanctuary for Venus.
In 1943, German troops built a bunker and Flak emplacement into the South East Corner of the cairn, which completely destroyed one of the chambers and caused the collapse of the second one pictured above, which has since been restored.
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.