The Piscina Mirabilis is an Ancient Roman cistern on the Bacoli hill at the western end of the Gulf of Naples, southern Italy. It ranks as one of the largest ancient cisterns built by the ancient Romans, compared to the largest Roman reservoir, the Yerebatan Sarayi in Istanbul.
The adjective Mirabilis was given by the 14th c. Tuscan poet Francesco Petrarca on one of his visits.
Wikipedia https://en.wikipedia.org/wiki/Piscina_Mirabilis
Info http://www.napoliunplugged.com/piscina-mirabilis.html
Address Via Piscina Mirabile, 80070 Bacoli, Italy
Coordinates 40°47'42.669" N 14°4'49.014" E