Ninfa, declared a Natural Monument by Regional Law in 2000, is located in the municipalities of Cisterna di Latina and Sermoneta. It was a medieval city for which reminiscent evidence still exists, including part of the castle, the walls, the completely restored municipal building and relics of churches and city buildings. Above all, Ninfa, is a magnificent natural oasis, unique in the world, created where once marshes reigned. The history of this place began, basically, in the middle of the 8th century, when it was given to Pope Zacharias by the Emperor of Constantinople. Since then, it has belonged to various powerful families, such as the Counts of Tuscolo, the Frangipane family (during whose rule Alexander III was crowned Pope on 20 September 1159).

Finally, it became the estate of the Caetani family that began what would be one of the most splendid periods through the election of Benedetto Caetani to the Pontifex (1294) with the name Boniface VIII. The city was again destroyed in 1382 and completely abandoned. It was necessary to wait until 1920 to see Ninfa return to life, after a series of extraordinary recovery interventions implemented by Gelasio Caetani, son of Onorato and Ada, both of British origin, (total cleaning of the area, restoration and reinforcing of the buildings, planting of the first trees) and, thereafter, by Roffredo Caetani and his wife Marguerite Chapin (American) who was entirely dedicated to caring for the garden.
Visits to the Garden and ruins of Ninfa are by guided tour, which only run on special days during the year, from April to November