The Baths of Diocletian is a fragment of the large public bath complex in Rome, preserved to modern times only in fragments. This monument was destroyed for centuries, and many other buildings were built on the ruins. It was not until 1889 that the abandoned Carthusian monastery in the area of the former thermal baths was taken over by the National Museum in Rome. In the years 1908–1911 a number of restoration works were carried out here, during which preserved fragments of the original building were preserved and exposed.
The construction of the thermal baths was initiated in 298 by Emperor Maximian. A huge complex covering about 12 hectares was put into operation between 305 and 306. These baths were modeled on the Baths of Trajan. There were swimming pools with cold and hot water, internal gardens and a bar - a place for supplies.
The Baths of Diocletian were destroyed in 1561, when Pope Pius IV gave them to the Carthusian order. In the central part of the bathhouse, the Basilica of the Angels of God was built.
