It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

Italian horror legend Dario Argento’s own shop hides a sinister museum-dungeon in the basement.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

An archaeological treasure trove towers over the valley of Chiavenna.

The 1,000-year-old abbey is the birthplace of modern musical notation.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

Built to be the ideal penitentiary, this abandoned panopticon saw several revolts and even a prisoners' coup.

Though an earthquake destroyed this village in 1980, one former resident still walks its streets every day.

A medieval Italian village is fighting depopulation with this vibrant annual street art festival.

An ancient rogue artist community hidden next to one of the world's most glitzy and glamorous cities.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

This enormous sinkhole hides a secret world created from divine wrath.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.

An abandoned bell tower in the middle of nowhere is the last testimony of a forgotten medieval village.

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

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

A beautiful discovery site of prehistoric burials.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

An abandoned village, frozen in time by the threat of a landslide.