The largest stretch of the Berlin Wall is right on top of the former SS headquarters

One of the best-preserved pieces of DDR propaganda in Berlin.

The first, and perhaps only, monument dedicated to Wikipedia.

An abstract and eyecatching clock/fountain is the centerpiece of this little-known German city.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Historic medieval fortified city in southwest France.

Semi-mystical manmade towers of rocks decorate this rocky seaside.

A solitary lighthouse in Spain was an inspiration to the great Jules Verne.

The largest and best preserved necropolis in the Western Mediterranean.

An unexpected homage to 90s celebrities hidden in a corner of Ibiza.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This camera store in Milan holds one of Europe’s largest collections of luxury-antique cameras.

This poignant art installation raises awareness of violence against women.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Third time's a charm, or in this case, two testicles are.

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

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.