Hamburgers are intensely proud of their tunnel beneath the river.

Controversy surrounded the creation of this anti-fascist statue.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

This floating sculpture of ice is a poignant reminder of nature's power.

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

A taxidermied stork with an arrow through its neck proved that birds migrate.

A city's controversial tribute to its founder depicts townspeople flashing their bare behinds.

A carved figure embodying the palace’s pint-sized but protective spirit rooted in local folklore.

This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

Deep in the limestone cliffs of the Alabaster Coast, a German fortress built during World War II.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

Germany's longest suspension rope bridge.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Tiny castle in the middle of the Rhine made you pay to pass.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

The highest cold-water geyser in the world.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

An architectural oddity hides in plain sight on this iconic London bridge.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.