A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.

Beautiful views and Roman-style statues on the Italian coast.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

This 10th-century seaside abbey holds spectacular views and a window into the past.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

The oldest-known example of a historic architectural style recognized by UNESCO.

Southern Italy's spinning top village.

The sunlight passing through the opening of this huge cave system creates a magical effect.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

An impressive bridge over a ravine also served as an aqueduct.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

During World War II, the Shroud of Turin was secreted to this remote southern Italian complex.

The oldest volcanology research center in the world.

The first Italian factory to produce locomotives is now a marvelous museum.

Before the more famous Royal Palace of Caserta, the king of Naples first commissioned this overlooked residence.

For decades, vendors have sold clothes once worn by American soldiers who stormed Italy in the 1940s.

Pompeii's less famous neighbor is still revealing her secrets.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

According to the legend, this structure was built in a single night with the help of the devil.

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.