Where is The Fountain of Four Rivers?

The Fountain of Four Rivers - Regola The Fountain of Four Rivers - Sant'Agnese-in-Agone The Fountain of Four Rivers - Sant'Andrea - Della Valle The Fountain of Four Rivers - Castle of the Holy Angel The Fountain of Four Rivers - St. Angelo The Fountain of Four Rivers - San Eustachio The Fountain of Four Rivers - Klimovichi The Fountain of Four Rivers - Navona Square The Fountain of Four Rivers - Valvory The Fountain of Four Rivers - Fountain of Turtles The Fountain of Four Rivers - Ponte The Fountain of Four Rivers - Parione The Fountain of Four Rivers - Rota The Fountain of Four Rivers - Pantheon The Fountain of Four Rivers - Vatican City The Fountain of Four Rivers - Venice Square The Fountain of Four Rivers - Gualdo-Cattaneo The Fountain of Four Rivers - Spelonka The Fountain of Four Rivers - Orvano The Fountain of Four Rivers - Botto