The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

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

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

France's national museum of scientific and industrial instruments.

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

A museum of carnival attractions where you are invited to ride the rides.

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

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

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

Abandoned railway line circling the city of Paris.

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

Brasilia's oldest newsstand is sheltered by a wish-granting tunnel-tree.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

This kilometer-long university building is an unexpected architectural delight.

These termites have an large and deadly abode—impressive by day, dazzling by night.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

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

Statue of death tucked in the University of Medicine courtyard.

This Parisian fountain is a little bit fantasy and a little bit nightclub.