Dun Dornaigil is an Iron Age broch in Sutherland. The broch has an external diameter of about 14.5 metres. The walls generally survive from 2 to 3 metres around the circumference of the broch, but above the doorway they rise to nearly 7 metres. The entrance is on the northeast side but is filled with debris. There is a massive triangular lintel over the entrance which measures 1.4 metres along the base, and 0.9 metres in height. The interior of the broch is still filled with collapsed rubble from the upper levels and is therefore not accessible.
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.