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"These ancient caves are believed to date back to the mesozoic era, though they weren't opened to tourists until the 1980s. Now, you can see them on an hour-long guided tour. Just be warned, not all the guides speak English. The caves are in a pretty remote part of Lazio, about a 50-minute drive inland from Sperlonga, so the people who go are pretty committed to seeking them out (and not afraid of bats)." - Laura Itzkowitz, Arlene Gibbs