Fontana Di Trevi

The Trevi fountain is at the ending part of the Aqua Virgo, an aqueduct constructed in 19 BC. It brings water all the way from the Salone Springs (approx 20km from Rome) and supplies the fountains in the historic centre of Rome with water. (Source)

I did do my Anita Eckberg and cry "Marcello!" but they won't let you paddle these days.