A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

An icy lake tucked among jaw-dropping alpine panoramas.

A Gothic cathedral created from volcanic rocks.

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

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

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.

Notorious artist squat renovated into legal studios.

Quality time with reindeer in the stunning scenery of their natural Lappish habitat above the Arctic Circle.

A subterranean house of worship carved right out of the bedrock.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

This sublime architectural marvel is a rare example of an expressionist church.

A natural wonder in south Denmark.

Six beautiful wooden giants are hidden around Copenhagen.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.