Once the largest windmill outside of Holland, with enormous 114 foot sails.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Europe's first floating restaurant is home to a hilarious legend.

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

Singapore's landscaping project is home to 18 incredible Supertrees.

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.

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

A moving memorial to the fallen and missing from WWI trenches.

Preserving the research tools, unexpected inventions, and odd collections of generations of college professors.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Come for the flowers, stay for the bats!

Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This abandoned Greek island was the last active leper colony in Europe.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

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