The world's first underwater farm is home to more than 700 plants.

Geothermal waterfalls in Tuscany.

This network of roads is one of the most unique Etruscan creations ever discovered.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

The oldest botanical garden in the world that technically isn't the oldest.

Venice's "Island of the Mad."

Venice's island of the dead.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

One of the oldest libraries in the world is still operating and contains the oldest existing document in the Italian language.

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

An ancient artistic garden parlor full of hidden water wonders.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

See what remains of a once grand ancient Roman circus.

The secret medieval communication system will whisk your words above the noise of the crowd.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

Ham is serious business at the Prosciutto Museum-Serious, delicious business.

A completely underground tour following the path of the most precious element: water.

Since the 1960s, this small village has invited painters to decorate its walls.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.