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:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.