A French artist's vague warning hangs over Belleville.

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

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

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

This massive library holds what was once the largest book collection in the world.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A surrealist timepiece by the artist of melting clocks.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

France's national museum of scientific and industrial instruments.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A hugely vast Irish landscape of barren rock that stretches for miles.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

Northern Ireland's Brobdingnagian stepping stones.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.