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

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

Amsterdam's former hotspot for public executions and dissections.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The world's only museum devoted to the wonders of fluorescence.

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

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

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.

An ancient Egyptian temple sits within a modern European museum.

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