<Li> Baths of Trajan--these were a massive thermae, a bathing and leisure complex, built in ancient Rome starting from 104 AD and dedicated during the Kalends of July in 109 . </Li> <Li> Baths of Diocletian--in ancient Rome, these were the grandest of the public baths (thermae), built by successive emperors </Li> <Li> Baths of Caracalla </Li> <Li> Trajan's Column, in Rome </Li>

What materials did the romans use to build their structures