Surely the most suggestive is the Trevi Fountain, in Baroque style, famous for the film "La Dolce Vita" by Federico Fellini, where Anita Ekberg invites Marcello Mastroianni to immerse themselves in the fountain with her.
The Trevi Fountain is located in the homonymous square, next to the Conti di Poli palace. It was built by the hand of Nicola Salvi, commissioned by Pope Clement XII, after several projects for a monumental fountain in the past centuries had not been completed. The inauguration took place in 1735, but the fountain was only completed in 1762 with Giuseppe Pannini. The
Fontana dell'Acqua Paola is also very beautiful, known by all as the Fontanone, which is located on the Gianicolo hill. This is the terminal exhibition of the Trajan-Paul Aqueduct, built at the behest of Pope Paul V Borghese and made up of five large arches flanked by columns and the dedicatory inscription at the top. Unfortunately, it is only possible to visit the outside for free.
Not to mention the Fountain of Neptune in Piazza Navona. In short, there are so many fountains in Rome and it is worth visiting them all (for free!).