This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A cluttered and astounding collection of antiquities and curiosities.

London's smallest police station is barely the size of a phone booth.

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

The attic of a four-century-old canal house hides a clandestine church.

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

A public urinal so pretty, it was declared a national monument.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

A collection of biblical memorabilia.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

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.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

A statue of the second-tallest Dutchman in history.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.