Cullerlie stone circle, also known as the Standing Stones of Echt, consists of eight irregular stones of red granite arranged at approximately equal intervals to form a circle of 10.2 m diameter, enclosing the same number of small cairns.
At the time that the circle was built in the second millennium BC, the surrounding landscape was characterised by wet bogs, and the stones were transported to the site from higher ground some distance away. The tallest of the stones marks the north side of the circle. A 2004 survey of the site discovered that several of the stones had been carved with previously unnoticed cup marks.
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.