The Roman Thermae are a complex of ancient Roman baths in the Black Sea port city of Varna in northeastern Bulgaria. The Roman Thermae are situated in the southeastern part of the modern city, which under the Roman Empire was known as Odessus. The baths were constructed in the late 2nd century AD and rank as the fourth-largest preserved Roman thermae in Europe and the largest in the Balkans.
Ancient Varna, first a Thracian settlement and then an Ancient Greek colony, became part of the Roman Empire in 15 AD and was assigned to the province of Moesia with a certain degree of local autonomy. The Roman baths of Varna were built towards the end of the 2nd century and remained in use for about a hundred years, till the late 3rd century. Coins of Roman emperor Septimius Severus (r. 193–211) have been discovered among the bath ruins. Much later, in the 14th century, the ruins of the Roman Thermae were the site of craftsmen's workshops.
By area, the Roman baths of Varna are the fourth-largest among the preserved thermae in Europe. The thermae are the largest in the Balkan region and the biggest surviving ancient building in what is today Bulgaria.
The Roman Thermae of Varna feature the whole range of facilities including an apodyterium (changing room), a frigidarium (cold pool), a tepidarium (warm pool) and a caldarium (hot pool) as well as a palaestra (a space with social and athletic functions). Heating was provided by means of a hypocaust, an underfloor heating system of pipes.
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.