Fontana delle Tartarughe first water flowing to a reservoir near the present Trevi Fountain. Della Porta and the city of Rome made a plan to build eighteen new fountains connected to the new aqueduct. He began in 1572 with the fountain in Piazza del Popolo, then built the two famous fountains of Piazza Navona (1574–1578), and the fountain in Piazza della Rotonda in front of the Pantheon (1575). + In the original plan of 1570 a new fountain was to have been placed near the Theater of Marcellus in the Piazza Giudea, the site of a market in the Roman Ghetto. One of
Fontana di Piazza Colonna to the foot of the column of Marcus Aurelius. The source of the water for the fountain of Piazza Colonna was only 67 feet above sea level; like the Trevi Fountain, the Fontana della Barcaccia, and the fountains of Piazza Navona, all connected to the Acqua Vergine, the fountain of Piazza Colonna was unable to jet water high into the air. The original project of Della Porta was to place an antique Roman statue of a sea god, called Marforio, in the fountain, against a background of a rocky grotto, behind which the column of Marcus Aurelius would be seen.