Dolmen de la Madeleine is an isolated dolmen located in a private field on the outskirts of the town of Gennes. It was probably built between 5 000-2 000 BC. There are a number of these sites in the area - but this one is said to be the largest. Like many of the larger dolmens, it has subsequently been re-used, in this case to house a bread oven. Although the bread oven is no longer in use as the dolmen is now a classified national monument, you can still see the remains of the oven.
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.