Ride a boat through this magnificent underground world, which now doubles as a theater.

An omelette made with over 1,000 eggs may have been prepared when Holy Roman Emperor Charles V visited this monastery.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

One of the few places of its kind, this space research center sits deep in the countryside of Matera.

Southern Italy's spinning top village.

Geometry and mystery come together in an epic show of octagonal masonry.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

Architectureal fantasy quarter of Rome.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.