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

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Massive galleon from a box-office bomb docked in Genoa.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

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

An unusual house built using an iso-elastic membrane.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

A medieval weapon rumored to have been used by the brilliant poet himself.

A spiritual sanctuary in a natural cave.

Da Vinci's equestrian statue, 500 years in the making.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

A Milanese café entirely designed by the American director Wes Anderson.

Roman-era ships unearthed...

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

142 ceramic steps become a mosaic once a year.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.