The Trevi Fountain is an 18th-century fountain in the Trevi district in Rome, Italy, designed by Italian architect Nicola Salvi and completed by Giuseppe Pannini in 1762. Standing 26.3 metres high and 49.15 metres wide, it is the largest Baroque fountain in the city and one of the most famous fountains in the world.

Everyone knows the famous Trevi Fountain, less well known is the underground passages that stretch beneath the Trevi district. Of this intricate maze of ancient vestiges, the underground archaeological area of Vicus Caprarius – the City of Water is a part: the structures of an imperial domus, the castellum aquae of the Virgin Aqueduct and the evocative exhibits.