Thermae Thermae In ancient Rome, thermae (from Greek θερμός "thermos", "hot") and balneae (from Greek βαλανεῖον "balaneion") were facilities for bathing. "Thermae" usually refers to the large imperial bath complexes, while "balneae" were smaller-scale facilities, public or private, that existed in great numbers throughout Rome. Most Roman cities had at least one, if not many, such buildings, which were centres not only for bathing, but socializing, and reading as well. Roman bath-houses were also provided for private villas, town houses, and forts. They were supplied with water from an adjacent river or stream, or more normally, by an aqueduct. The water
Ancient Roman architecture of these developments are described by Vitruvius, writing in the first century AD in his work De Architectura. Although concrete had been used on a minor scale in Mesopotamia, Roman architects perfected Roman concrete and used it in buildings where it could stand on its own and support a great deal of weight. The first use of concrete by the Romans was in the town of Cosa sometime after 273 BC. Ancient Roman concrete was a mixture of lime mortar, aggregate, pozzolana, water, and stones, and was stronger than previously-used concretes. The ancient builders placed these ingredients in wooden frames