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

Jesus' footprints and the first catacombs in the world.

Venice's "Island of the Mad."

Pompeii's less famous neighbor is still revealing her secrets.

Geothermal waterfalls in Tuscany.

Thousands of well-dressed mummies below a monastery.

Stalactites and stalagmites in a beautifully lit cave.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

2300-year-old Roman road connecting the empire.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

An alchemist's "magic door" stands in the middle of a Roman park.

The underground sanctuary of a mysterious ancient cult.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A submerged archeological park still holds the wonders of a Roman Sodom.

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

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

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

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Architectureal fantasy quarter of Rome.

A 16th-century horror show built in a lovely Italian garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."