Over time, this castle grew to encompass the entire island.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

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

Descend into the tunnels to experience the life of a coal miner.

This little patch of Europe remained neutral for more than a century because of a mine.

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

The birthplace of most all of Europe's space missions is here on the Dutch coast.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This cheese shop also houses a museum devoted to Dutch dairy.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

One of Amsterdam’s most popular cultural and recreational complexes is on the site of a former gas works.

An Amsterdam School landmark combining a museum and social housing.

The world’s largest street art museum.

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

This mine is home to the largest man-made hole in Europe.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

Take a walk in a recreation of ancient Rome.

Home to the world's oldest functioning orrery.

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

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

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

Visitors can still take a train to this former train station turned museum.

The Siege of Naarden ended in 1814, but the cannonballs embedded in the town church remain.