The sunlight passing through the opening of this huge cave system creates a magical effect.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

A dead saint, a deadly poison, and a mysterious holy ooze.

This unique building in the main square stands out among the city's typically Baroque architecture.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Of course Salvador Dalí lived in a castle...

A modernist church in an ancient village.

This embalmed man is one of the best preserved mummies from the Canary Islands.

The final resting place of the great navigator, or maybe his brother.

A hidden three-foot-wide house separates these two regal churches.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

This castle has links to Portugal’s founding and struggles for independence.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

The largest underground church in Europe.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

The mummified relic of St. Antoninus.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

Contains some of the world's more disturbing wax anatomical models.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

An ancient rogue artist community hidden next to one of the world's most glitzy and glamorous cities.

The location of the last witch trials of Italy, known as "The Salem of Europe."

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.