The Medieval Castle of Tilos is located to the north of Megalo Chorio, the capital village of the island. Built atop a hill by the Knights of Saint John, during the late Byzantine period, this medieval castle offers spectacular views across the bay of Agios Antonios and a late-afternoon visit probably offers one of the best sunsets on the island. The church of Archangel Michael was built within the castle complex in the post-Byzantine period.
An entire village was once built within the castle walls to protect from the pirates who plundered the Aegean in the Middle Ages and it was not until the 18th century, when piracy was suppressed, that many of the inhabitants started to migrate down and settle closer to the foothill.
The castle and the church enclosed within the walls were built over the remains of a Hellenistic acropolis which included a temple dedicated to Apollo and Athena. The imposing castle had a triangular ground plan, but nothing much remains of it except for the external wall, some ancient and medieval ruins, cisterns and the ruins of the church along with some of its 14th-15th-century frescoes. To the east of the Castle, you can find the ruins of the Messaria fortress, built around 1366 by the Knights of Saint John.
The fortress protected the road leading towards the fertile plains of the island. Within its massive walls, the ruins of several buildings and of a little church are found. The remains of a Byzantine settlement and of small chapels dating back to the 13th century can be found close to the fortress. The walls of the churches are covered with frescoes. Above this fortress, there lies the famous Charkadio Cave, where the fossils of a pygmy elephant were unearthed in 1971.
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.