This bronze statue of Martin Luther King was placed in the park without permission.

The location of the world's first telescope demonstration.

This Dutch art piece became a Russian icon.

The former headquarters of history's oldest megacorporation.

A curious collection dedicated to human and animal anatomy and pathology.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

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

This 135-year-old weather station studied the effects of the climate on human health.

Island wonderland for communist autocrats.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

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

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

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Where the lovelorn find a home for their sentimental keepsakes.

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.

A surreal museum of extraordinary industrial objects.

One of the world's heaviest musical instruments towers within a popular urban park.

Reminders of the Battle of Berlin still scar the railway.

The most visited, and possibly most controversial, museum in Germany.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.