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

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

Exploring the Netherlands’ textile past and future under one roof.

The most impressive of Basel's three remaining city gates.

This artistic fountain display pays homage to this area's theatrical history.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This Late Gothic building that once housed Erasmus is now known as the filming location of "Suspiria."

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

Located in a heritage building, this Mickey D's is missing its Golden Arches.

Colorful and chaotic stacked hotel in North Holland.

Rejoice at Amsterdam's ‘pop temple,’ a former church reborn as a raucous music venue.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

This may be the world's only drive-through windmill.

A grassy pyramid named after a French battle.

The cutest way to stay safe in traffic.

The world's first fish doorbell monitors this water passageway.

The imposing structure was originally established in 1580 as a military stronghold.

This functional solar system model was inspired by the famous Eisinga Planetarium.

A tiny art gallery where artists can donate their work for the public to take and enjoy.