For over 300 years this little carving has been the city’s good luck charm.

This garden houses the remains of the ancient Greek port of Marseille.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

Longest canal tunnel in the world, abandoned in the 1960s.

An often-shuddersome journey into a low-tech, robotic themepark.

A French library that makes sure its love of books is writ large... giant in fact.

This abandoned Belgian fortress is purposefully being left to nature.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Stockholm's narrowest alley is barely over two feet wide.

A wooden street sign is the last remnant of this 400-year-old alleyway.

This stone obelisk is a relic of the 17th-century Swedish mile markers.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

Sweden's first electric elevator remains hidden within a fortress-like building.

A Japanese video game arcade hides in the back of a Swedish pool hall.

Sweden's largest optical telescope sits on a rooftop in Stockholm.

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

"Only the dead get off at Kymlinge."

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.