The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

What looks like a normal building is really a hollow facade hiding a subway vent.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Ghosts of France's colonial past.

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

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

The wooden airship was the largest flying boat ever built.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

These mythological giants take time out of their busy day guarding a Victorian market to let you know what time it is.

The largest shot tower in Australia is a unique reminder of industrial ammunitions history.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

A French artist's vague warning hangs over Belleville.

This banal Parisian entranceway is not what it seems.

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Take a cruise with no movement but plenty of style in this one-of-a-kind boat mall.