Twisted buildings adorn the banks of the Rhine river.

A varied collection of brains in alcohol.

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

This "floating railway" is one of the world's oldest monorail systems.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The highest point in Belgium is a staircase to nowhere.

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

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A former Nazi lookout tower with a magnificent view of the Rhineland.

Medical history with an amazing, if frighting, collection of wax diseases on display.

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

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A small granite monument marks where the borders of three countries meet.

Site of one of World War I's most horrific scenes.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

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

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

Ancient man-made caves underneath small town Belgium.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

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