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

Repository for more than 22 million pickled specimens.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

This 1920s Dutch barge is now a floating bookstore.

A cluttered and astounding collection of antiquities and curiosities.

An incarceration museum on the spot of possibly the oldest prison in England.

A historic house left in "dramatic still life."

Catacombs turned marketplace.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Eighty million natural history specimens call this gargantuan museum home.

The curios of pharmacist and collector Henry Wellcome.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A hands-off space for graffiti artists to hone and display their skills.

One part local history, 99 parts gruesome haunted house.

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

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.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.