Tantallon Castle is a ruined medieval fortress atop a promontory opposite the Bass Rock, looking out onto the Firth of Forth. It was built in the mid 14th century by William Douglas and was the last medieval curtain wall castle to be constructed in Scotland.
Despite several sieges, Tantallon remained the property of Douglas descendants for much of its history. It was besieged by King James IV in 1491, and again by his successor James V in 1527, when extensive damage was done. Tantallon saw action in the First Bishops' War in 1639, and again during Oliver Cromwell's invasion of Scotland in 1651, when it was once more severely damaged.
Tantallon is a unique construction within Scotland, the defences comprising only a single large wall securing a coastal promontory. The south-east, north-east, and north-west approaches are naturally defended by steep sea cliffs and were only ever protected by relatively small defensive walls. To the southwest, a massive curtain wall blocks off the end of the promontory, which forms the inner courtyard. The curtain wall is built of the local red sandstone and has a tower at each end and a heavily fortified gatehouse in the centre, all of which provided residential accommodation.
The ruin is today in the care of Historic Environment Scotland and open to the public.
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.