Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The mark of the Devil's horns on a marble column in Milan.

Fortified medieval tower house with lovely roof garden.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

Largest necropolis in the Mediterranean.

Every inch of this chapel is covered in craftsmanship from across the world.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

A spiritual sanctuary in a natural cave.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

The mummified relic of St. Catherine sits forever on a golden throne.

Geometry and mystery come together in an epic show of octagonal masonry.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

This large, circular tomb is the final resting place of the first emperor of Rome.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

This precariously perched fortress was once ruled by a crow-worshipping baron.

A medieval weapon rumored to have been used by the brilliant poet himself.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

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