Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

Egyptian Revival movie palace abandoned for decades and restored in 2013.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This modest marker near Notre Dame identifies the very center of Paris.

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

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

Ming Dynasty necropolis raided during the Cultural Revolution.

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

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

Rows of stone statues are dressed up to mourn children that are lost before birth.

A giant robo-cockroach building devours Tokyo.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Not quite the menace it once was, this monster still has some chops.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

A 20-meter (65-foot) robot towers over Tokyo Bay.

The original "capsule building" is a masterpiece of Metabolist architecture.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

A magical place that lets you play in and explore the world of Studio Ghibli.