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

Hiding the longest subterranean river known in the world.

This collection of lurid religious statues tell the tales of a saint who stood down the devil.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

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

A gender-bending antihero's grave, where lies the inspiration for both book and film.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

You would never come across this tiny green oasis if you didn't know it existed.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Christ's blood preserved in a Belgian town.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

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

Building Men of War and Indiamen from Holland's Golden Age.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

The Netherlands' first car tunnel has an unusually rectangular shape.

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

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A miniature city, once ruled by the Queen of the Netherlands.

The 20-mile causeway that separates the Netherlands from the sea.