The structure may have reached 15–17 meters tall, although not as high the remains are still impressive. Along the southern face of the building are the warm rooms of the bathhouse, placed to take advantage of the sun's passive heating. Here a modern visitor can see the octagonal sun-bathing room (heliocaminus), an elliptical sweating room (laconicum) two tedpiaria and a caldarium with three pools. The palaestra was surrounded on three sides by porticos which shaded the entrance to shops. Many hairpins were recovered during excavations proving that the baths were used by women. It is assumed that this would be at a separate time of day from men, but no clear evidence exists. Baths of Buticosus This small bathhouse (I, XIV, 8) was constructed during the reign of Trajan circa 110 C.E. and remodeled in the middle of the second century C.E. This bath is typical of many of the balnea in Ostia, where the rooms are built into the established city grid leading to a chaotic interior layout often without a palaestra. In Room 4 is a black-and-white mosaic with marine animals and a man. Besides the man is an inscription EPICTETVS BVTICOSVS, giving the bath house its modern name. This man was a bathing attendant and holds a bucket and a stick. In the caldarium is another black-and-white mosaic with a marine scene of Triton and Nereid. The bath was supplied with water by a tank equipped with a noria in the adjacent Republican Sacred Area. These baths also preserved frescoes with garden images, creating an illusion of a real garden. Baths of Mithras The baths of Mithras (I, XVII, 2) were built around c. 125 C.E. and modified in the early Severan Period. The eponymous mithraeum was built in the late second or early third century C.E. and is accessible by a staircase in the northern part of the building. The remains preserve evidence of the utilitarian aspects of a Roman bathhouse such as a waterwheel for bringing water into the bathhouse and a boiler room for heating the caldaria and tepidaria. The frigidarium contains an apsidal pool and a mosaic showing Ulysses and the Sirens. Some of the earliest Christian imagery found in Ostia comes from the Baths of Mithras. Small Baths This bath (I, XIX, 5)(c. 385 square meters) was built in late antiquity around 450-500 C.E. reusing Hadrianic bricks. It was accessible only from