A contemporary art installation housed within a Gothic cathedral.

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

The oldest Marian image in the Canary Islands still impresses people nearly half a millennium later.

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

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

Copenhagen's celebrated theme park and gardens.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

This ordinary street was made infamous by a legendary visit from the devil.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

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

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

Picturesque intersection of witchcraft and ancient Christianity.

A submerged village appears when dam levels drop.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

One of the few places in Portugal where the Celtic ritual of wearing large wooden masks is still practiced.

This is what trains will look like after the zombie apocalypse.

One of the largest Roman settlements in Portugal.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The corpse bride of Portugal.

This abandoned five-star hotel is now a five-star urban exploration destination.

A small Portuguese cottage formed between boulders in the countryside.

Museum preserving torture methods from the past.