A fairy tale castle in modern Rome.

Jesus' footprints and the first catacombs in the world.

An Italian hillside ghost town.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Architectural monsters are devouring this palace's every door and window.

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

The glowing blue Nymphaeum of Emperor Tiberius.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Venice's "Island of the Mad."

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.

Geothermal waterfalls in Tuscany.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Stalactites and stalagmites in a beautifully lit cave.

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

The middle finger of modernity.

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

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

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

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

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

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

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

A swath of France so devastated by war it is still forbidden to go there.