|The "Tempio di Giove Anxur" is an ancient temple (part of it are dated 4th century B.C.), located on the top of the city of Terracina. The name "anxur" means "young".|
beside being a great historical mark, it is also considered a wonderful place where you can have a breathless view of the entire Terracina Gulf, from the Circeo Mount to the city of Gaeta. On very clear day you can even see the Vesuvio Vulcano.
Additional info: http://www.windoweb.it/dossier/cartoline/Sabaudia_Circeo/terracina_tempio_giove.htm (Italian only)