This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

A geothermal energy project gone wrong is fracturing the city's picturesque architecture.

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

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.

One of the most iconic neon ads of former East Germany.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

A famed artist's inspiring work of peace and tolerance.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

Europe's official "zero-level," the equator of elevation.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This 13th century Gothic brick castle is the largest in the world by surface area.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.