This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A tiny church on a man-made island in the Adriatic.

A curious cave church carved into the face of a cliff.

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

A giant bug impaled on a 75-foot-tall needle.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

A replica of a 17th-century map of the stars stands in the courtyard of a Belgian university.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Amsterdam's former hotspot for public executions and dissections.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

This ordinary street was made infamous by a legendary visit from the devil.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

Most prolific publishing house in the 1600s open to the public.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A taxus-tree to which Julius Caesar reputedly tied his horse.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A Cold War command center is hidden under an idyllic countryside.