The largest of the baths in Rome are the Baths of Diocletian, which were commissioned by Maximian in 298 A.D and finished by emperor Diocletian between 305 and 306 A.D. Like the Baths of Caracalla, the Baths of Diocletian were made from concrete and the design included central vaults and decorations of stucco, statues, and frescos. Although the Baths of Caracalla and the Baths of Diocletian were roughly the same size, a big portion of the Baths of Caracalla was gardens where as in the Baths of Diocletian most of the area was dedicated to baths. The Baths of Diocletian could fit about 3,000 bathers. It was located near the Viminal Hill, near Termini. Because of this the Baths of Diocletian have been altered and destroyed more then the Baths of Caracalla. From the Middle Ages until the 16th century, many popes have used the ruins of the Baths of Diocletian for monasteries, granaries, and prisons. In the 16th century, Michelangelo converted the main hall of the Baths of Diocletian into the church of S. Maria degli Angeli. Since Michelangelo respected classic antiquity, he preserved the vaulted hall and the eight giant red granite original columns, and tried to change very little of it. A huge portion of the area was destroyed during the 1870’s during Rome’s urban development. Since 1889, part of the central bath block houses the National Roman Museum.