Virgil's many-mouthed gateway to the underworld.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Natural cathedral designed by Italian artist Giuliano Mauri.

Abandoned medieval hill town.

Once the hottest nightclub in France, Amnesia now lies in ruins after a 2000 bombing.

Humble beginnings for one of the world's most famous scientists.

A musical instrument played by the sea.

Ruins of a 10th century church tucked away deep in a botanical garden.

The bomb-ravaged remains of of a colossal Neptune.

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

A fairy tale castle in modern Rome.

Largest necropolis in the Mediterranean.

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

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Renaissance villa and gardens complete with a tormented colossus.

Geothermal waterfalls in Tuscany.

The oldest operating pharmacy in the world features 800-year-old recipes.

Medieval torture techniques with a modern conscience.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

This 16th-century monastery has been turned into a surrealist architecture compound.

Odd outsider art installations surround a Gold Rush-era ghost town.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

The ghost town that ended up on Ebay.