Neptune and Organ Fountains, Villa d'Este, Tivoli

Cardinal Ippolito II d'Este turned a hillside at Tivoli, east of Rome, into a Renaissance garden run entirely on gravity-fed water, now a UNESCO World Heritage Site. This view shows the tall jets of the Neptune Fountain, a 20th-century reworking of an older cascade, rising in front of the Organ Fountain. The Organ Fountain is the showpiece: falling water drives air through organ pipes so the fountain plays music, and the organ is still set going at intervals through the day.