A striking 12th-century-style castle built on the edge of a cliff.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

A former ironworks that was the first UNESCO industrial site.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

Ruins of an aerial tramway that ran for only eight years.

A preserved college lock-up that recalls a clubhouse approach to discipline.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A German apartment building hosting as many trees as human occupants.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

This painted Lego bridge is the product of over a century of locomotive history.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

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

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

At this unusual park, domes, ladders, chairs, and more are made from trees.

Amöneburg is a town perched on top of a basalt mountain in the middle of an ancient meteor crater.

A strange rock formation with numerous legends trying to explain it.

A tiny basalt mountain with an observation tower overlooking the beautiful Bavarian countryside.

Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

A Neolithic burial site erected around 3000 BC.