The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Mountain where Jesus was first tempted by the Devil.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Cave shrine on Monte Pellegrino.

Dancing skeletal figures pay homage to a medieval mural destroyed during World War II.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This cemetery features modernist statues as strange as its name.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Inside a former cabaret, seven floors of erotic art.

Weird wax anatomical models reside here, as do other anatomical specimens.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

French commune at the heart of conspiracies.

Natural mummies hidden in the crypt of a medieval French church.

Stonehenge has nothing on Castlerigg’s views.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.