Ancient paintings known as the "Sistine Chapel of Cave Art."

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

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

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

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

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

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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.

France's most famous cemetery, with some of its most curious tombs.

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

This spa shower is an interactive art piece that reflects the feeling of Scandinavian seasons.

A medieval church that contains murals from famed artist Albertus Pictor.

The final resting place of the father of modern biological taxonomy.

Explore the frozen river and take a walk to a nearby island on some of the longest ice roads in Sweden.

The unique design of this former quarry provides ideal acoustics for concerts.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

An abstract representation of weather in Sweden.

A living descendant of the famous tree that helped Isaac Newton develop the theory of gravity.

A rare rune stone dedicated to a woman.

This serene wooded hilltop has a dark history as the climactic point of the Swedish witch trials.