Erotic art covers the walls of the largest ancient pleasure palace.

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

Ancient snack bar of the Roman Empire re-opened.

The walls and streets of the ancient city are peppered with penises.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A sulfuric hellscape in southern Italy.

Virgil's many-mouthed gateway to the underworld.

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

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This 17th-century manor house provides a fascinating glimpse into old-world Mallorcan life.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

This influential Renaissance-era library was once the haunt of kings and monks.

A historic Christian shrine nestled within a spectacular natural cave.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A contemporary art installation housed within a Gothic cathedral.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

This colorful statue welcomes visitors to a Barcelona park.

An early 20th-century bullring converted into a modern shopping center.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.