A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

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

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

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

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

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

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.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

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

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

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.

An unusual resting place built into the hill with an amazing view of Lake Como.

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

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

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

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

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

A stunning medieval castle houses this eclectic, interactive tribute to all things wine.

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

This medieval mountain town is also known as the "Village of Streams."

A beautiful discovery site of prehistoric burials.