An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Europe's official "zero-level," the equator of elevation.

A beautifully eclectic mix of architectural styles.

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

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

An ingenious Dutch land art project uses grass ridges to cut airport noise pollution in half.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

Small transmitter operated by a priest in the Netherlands.

The remnants of a WWI naval mine that once terrorized the country now decorates a street.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

An ancient Egyptian temple sits within a modern European museum.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

This century-old street sign is a forgotten remnant of the old city.

Science meets wall art to highlight the beauty of famous mathematical equations.

The location of the world's first telescope demonstration.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.