A memorial to the only dog ever officially enlisted in the Royal Navy.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

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

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

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.

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

This public library and its impressive collection of academic books have not changed since the 17th century.

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

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

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The location of the world's first telescope demonstration.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

The world's first interactive human body museum also serves as a chair for a giant orange man.

A floating cat sanctuary on an Amsterdam canal.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

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

One of Amsterdam's narrowest houses is located right across the canal from its widest.

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

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