This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

Visit on a Sunday morning to see some killer tricks.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Taxidermied animals galore, by appointment only.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Eighty million natural history specimens call this gargantuan museum home.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

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

Abstract dinosaur models in London.

The remains of Crystal Palace Great Exhibition of 1851.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

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

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

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A former connection to City Island, it has been abandoned since the 1930s.