Thought to be one of the most beautiful Roman fountains, it was built in travertine by Gian Lorenzo Bernini in 1643. Between the dophins' tails which support the shell on which the Triton crouches, Bernini placed two coats of arms of the Barberini family. The Triton which blows in the shell pushes out a jet of water, which, falling on the valves which direct it into the basin below, creates an incredibly choreographic effect. It was restored both in 1932 and 1990.