The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

An ancient knight and a symbol of the city's freedom.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

Longest fortress system anywhere in Europe.

Gargoyle head that brings good luck.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

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

The design of this beautifully crafted building was inspired by Norwegian glaciers.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

Copenhagen's celebrated theme park and gardens.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Amsterdam's former hotspot for public executions and dissections.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.