A striking memorial to the Jews of Leiden who were murdered during World War II is scattered throughout the city.

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

The location of the world's first telescope demonstration.

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

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.

Lumps of significant stone from around the world surround a flaming monument for peace.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

Mosaics created from 11 million cigar bands.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

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

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

In the Netherlands, one of the world's largest private car collections can be found.

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

The mirrored section takes the shape of Hebrew characters when viewed from above.

An ancient Egyptian temple sits within a modern European museum.

A statue of the second-tallest Dutchman in history.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

A true Valhalla for cactus and succulent lovers.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

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