For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

The last Victorian market in Belfast.

A galley-shaped memorial to the prisoners of an infamous fortress.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The video game-themed street art first popped up in the French city.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

The narrowest street in Paris.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

An unusual number plate signifies the building's saucy past.

The Sun King's military models, saved from the Louvre.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

The first green space constructed on an elevated viaduct.

This Parisian café sticks almost exclusively to an ethos of reuse.

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

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

This pair of running lions engraved on animal bone is one of the earliest artistic depictions of big cats.