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

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

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

A former plague hospital turned medical museum.

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

Only a few walls remain of the last church the Pilgrims used before they sailed to North America.

A tiny house showcases the busy life of a local gnome.

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

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

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

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

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

One of the great math minds of the 17th century is underfoot in this 900 year old Dutch church.

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A living memorial to the trees London lost during the Great Storm of 1987.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

These ornate arches show how the course of the River Thames has changed.

A series of carved figures that scandalized British society.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.