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

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Incredible labyrinth of man made caves.

This historical Netherlands fortress still bears the marks of its single siege.

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

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

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

Of course Salvador Dalí lived in a castle...

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A grassy pyramid named after a French battle.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.