The Quoyness chambered cairn is located on Sanday in Orkney. It is approximately 5,000 years old and is located on the shoreside.
The cairn is about 4 metres high and can be accessed by crawling through the entrance passage, itself 9 metres long. Only half the entrance passage is roofed. A stone platform surrounds the cairn, and when originally built the cairn would have looked like Maeshowe today. Bones from 10 adults and 5 children were removed. The property is now in the care of Historic Scotland.
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.