This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

A network of underground water channels that dates back to the Middle Ages.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Every Easter, a small Sicilian town builds a stunning cathedral out of bread.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

A madman's personal garden filled with 1,000 sculpted heads.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

The world's most active stratovolcano is almost always erupting.

An ancient artistic garden parlor full of hidden water wonders.

The mummified relic of St. Antoninus.

100 year tradition of fist fights, marked by marble footsteps.

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

Ancient snack bar of the Roman Empire re-opened.

One of the largest caves in the world open to the public.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This Italian foot path winds through the mountains via 52 individual tunnels.

Romans built the world's tallest artificial waterfall in 271 BC.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.