The Fontana di Trevi or Trevi Fountain is the most famous and likely the most beautiful fountain in all of Rome. This impressive monument dominates the small Trevi square located in the Quirinale district. The fountain at the junction of three roads marks the terminal point of the "modern" Acqua Vergine , one of the ancient aqueducts that supplied water to ancient Rome built in 19 BC.

A previous undertaking to build the fountain after a design by Bernini was finally carried out a century after the death of Pope Urban VIII. Only in 1732 did Pope Clement XII commission Nicola Salvi to create a large fountain at the Trevi Square. Salvi based his theatrical masterpiece on this design. Construction of the monumental baroque fountain was finally completed in 1762. Palazzo Poli was the backdrop for the fountain. It was then given a new facade with a giant order of Corinthian pilasters that link the two main stories. Tritons guide Oceanus' shell chariot in taming seahorses. Taming of the waters is indeed the theme of the gigantic scheme, mixing water and rockwork, and filling the small square with its glamorous late baroque grandness.

A traditional legend holds that if visitors throw a coin into the fountain, they are ensured a return to Rome. Also current interpretation has it that two coins will lead to a new romance and three will ensure either a marriage or divorce.