This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Denmark’s never-ending bridge.

Old Danish castle immortalized in Shakespeare's Hamlet.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

A unique bridge with an equally unique view.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Legends surround an ancient tree trunk riddled with nails for good luck.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

This poignant art installation raises awareness of violence against women.

The mark of the Devil's horns on a marble column in Milan.

A brutalist gem towering over the heart of Milan.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The secret medieval communication system will whisk your words above the noise of the crowd.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.