The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

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

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Historic medieval fortified city in southwest France.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

A science fiction-inspired apartment building designed by a famous Spanish architect.

An architect transformed this abandoned cement factory into his castle-like workshop.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

This museum houses an imposing skeleton army comprised of creatures great and small.

A haunting collection of the vanished and disappearing natural world.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The oldest stone house in Paris was built by its most famous alchemist.

Notorious artist squat renovated into legal studios.

This peaceful oasis appears dreamy, but it's also the site of a nightmarish legend.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

Inside the columbarium, thousands of colorful, high-tech Buddhas guard the ashes of the dead.

During the rainy season, this temple is almost entirely submerged, accessible only by boat.

Monkeys lounge around at this 13th century temple.