A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Venice's "Island of the Mad."

This small Slovenian town has become a magnet for microbreweries.

One of the world's oldest olive trees, thought to be over 2,000 years old.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

This abandoned Slovenian military barracks has become a punky-political art squat.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This natural gas vent certainly earns its name as the smallest volcano in Italy.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.