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

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

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

A cherry tree growing atop a mulberry tree.

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

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

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

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

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

Italy's curious field of mud volcanoes is named for being both gross AND salty.

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

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

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.

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

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

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

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

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

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

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

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