Ottoman-era houses lovingly preserved.

Naturally protected city carved from a rock face.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

The ancient abodes are a testament to human ingenuity amid harsh climates.

The ornate miniature mansions were built for Istanbul's feathered residents.

A former salt mine is now a cool picnic spot for families and asthmatics.

This oddly shaped church resembles a rocket.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

One man's remarkable private collection of art from around the world.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This charming candle shop has been in business since 1789.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Notorious artist squat renovated into legal studios.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.