A long-buried ancient ruin unearthed right in the middle of the city.

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

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

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

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

A small island in Lake Garda that was used as a burial site, pirate hideout, and a monastery.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

Atop the former site of a historic bakery sit two stone tributes to Verona's contribution to traditional Italian baking.

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

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

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

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

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

This small but lovely sinkhole lake is the last remnant of a great prehistoric water basin.

A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

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

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

A medieval stronghold rising over the ruins of ancient Roman villas along Rome's southern coast.

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

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

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

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