The only surviving Roman (Theater/Public baths/Palace/Temple) Of the first order was built by Diocletian at spalatro in dalmatia

Answer 1

. This structure is known as Diocletian's Palace and is now a UNESCO World Heritage Site. It served as a residence for the Roman Emperor Diocletian in his later years, and later became a center of the Byzantine Empire. It is one of the best-preserved Roman structures in the world and is a popular tourist destination in Croatia.