The Castle of the Masovian Dukes in Płock is a Gothic castle built under the reign of Casimir III the Great, becoming a stronghold of the Dukes of Masovia until the fifteenth century. The castle is located on a steep Vistulan hillside, most likely since the eleventh century, a wooden fortress - defended by walls and dikes, where in the middle there was a small stone built stronghold. On the turning point of the eleventh and twelfth century, when one of the largest Masovian strongholds where already located on the hillside - a chapel and wall-defended living quarters were built in 1194.
At the end of the thirteenth century, the raising of the castle had begun, when the stronghold was fortified, and took on its current form under the reign of Casimir III the Great. The expansion of the castle was done on the hillside of the former stronghold, which was reconstructed with bricks and expanded, the stronghold was also raised with two towers. The castle was built in square-shaped complex. In the south-west of the complex, the Szlachecka Tower was raised - with a squared base and lower half; and an octagonal upper half. In the northern part of the castle, by a Romanesque building, there is a clock tower. The castle's courtyard is closed off by the north-western, eastern and southern wing. The castle is fortificated by a double encirclement of defensive walls - securing the stronghold and Płock, being just outside the castle's walls.
The castle was a residence of the Masovian Dukes up until the fifteenth century. Due to a partial removal of the hillside, in 1532, the castle suffered damage, which was rebuilt. In 1538, the Masovian dukes had resided in the newly built palace, outside the castle walls, allowing the castle complex to be given to the Benedictines. During the times of the wars against the Swedes, the castle was severely damaged, first in 1657, and then in 1705. After the castle's reconstruction, the castle complex became a Baroque architectural style Benedictine Abbey, which existed until 1781. When after the Partitions of Poland, Prussia took over the castle, the authorities ordered some of the defensive walls to be deconstructed. From 1865, the castle hosted spiritual seminars.
After World War II, the castle was renovated, and since 1973, the castle houses a museum.
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.