Underground tour

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Though many of the world's most impressive churches feature high ceilings and soaring spires, sometimes you have to go underground to find the real gems....

Le splendide e scenografiche Grotte di Frasassi sono delle grotte carsiche sotterranee che si trovano all'interno del Parco naturale regionale della Gola della Rossa e di Frasassi nel comune di Genga (AN). Per le foto: comunicazione.turismo@regione.marche.it

Book your tickets online for Rocca Paolina, Perugia: See 2,083 reviews, articles, and 827 photos of Rocca Paolina, ranked No.10 on Tripadvisor among 166 attractions in Perugia.

Naples underground hides many ancient secrets from the past. Discover a Roman theatre, hidden passages, ancient markets and water cisterns.

Sure, you could stay in a normal hotel with regular walls that’s built on a typical ole’ foundation. But that’s just so boring. If you’re traveling the world for the experience of it all, why not opt for a totally unique feat and sleep in a cave? And yes, modern amenities are included. Here, ten cave rentals that might trump a four-star hotel.

A priest in Naples' tough Sanità neighborhood has put local kids — some from mob families — to work restoring underground catacombs full of early Christian art. The result? 40,000 tourists a year.

The reasons to visit Naples, Italy are endless. The best pizza in the world, delicious pastries, and ancient underground Roman ruins.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

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size: 24x16in Photographic Print: Cave of the Sibyl, 4th-3rd Century Bc, Cumae, Campania, Italy :

Most tourists don't know about underground Rome, the secret city beneath the city. Find out why you need to go below ground see it & the treasures it holds!

Many people are familiar with the Oracle of Delphi, where Pythia, the priestess of Apollo was said to relate messages from the god to the temple visitors. The specialness of this place was recogniz…

A 2,000-year-old engineering wonder hides beneath an Italian town.