This fountain is located at the center of the gardens, a mystical masterpiece set in a semicircular recess between two steep semicircular staircases descending from the Avenue of 100 Fountains. The four winged dragons are the symbol of the family of the reigning Pope at the time, Gregory XIII, who visited d'Este at Tivoli. The fountain is set in pools in the shape of shells and dolphins. Water spouts from each dragon as well as from a high jet of water in the center. It is important to remember that the height of each water spout was determined by gravity and the size of the tubing in each fountain. In back of the fountain is a niche containing a giant statue of Hercules, Tivoli's hero. Many member of the d'Este family took the name Hercules. The steep staircases represent the difficulties faced by Hercules in his struggle between virtue and vice. The fountain represents the 11th effort of Hercules in killing the 100 headed dragon to recover the golden apples of the Garden of the Espiridi. On the accompanying images, the statue of Hercules is difficult to appreciate as it is shaded throughout much of the day. On the second image, note the palace in the distant background up the steep incline.
Take its name from the devices invented by Tommaso de Siena, because water caused crackling alternating with outbreaks. The fountain is spectacular and for this reason it has been placed in the greater axis of the park. The fountain represents the eleventh effort of Hercules who kills the one hundred heads dragon in order to get hold of the gold apples of garden of the Esperidi and give them to Euristeo.
En un principio la fuente fue llamada de la Girandula, por los complicadisimos artificios hidraulicos de Tommaso de Siena. Esta situada en el centro del jardin. La fuente representa la onceava prueba de Hercules que mano al dragon de cien cabezas.