The most iconic fountain in Rome and highly acclaimed across the world is the Trevi Fountain. Set against the backdrop of Palazzo Poli, this is the pièce de résistance of Nicola Salvi’s architectural career. Sadly, he died in 1751 after 19 years of work. The project was completed 11 year later. Fontana di Trevi is enormous, measuring 86 feet tall and 161 feet wide. According to tradition, if you throw a coin over your left shoulder in the fountain, you will someday return to Rome. Whether this is true or not, you will be helping to generate $1.5 million annually.