Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

More than a million titles fill the labyrinthine shelves of this prestigious private library.

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

This home on a quiet suburban street is completely covered with vibrant mosaics.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Catacombs turned marketplace.

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

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

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Banksy gives themself artistic license with this piece of London street art.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Finally reunited, the three effigies now stand in a museum courtyard.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A hollow cement depiction of time's inexorable effect on the human body.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

This historic Victorian hotel has a scandalous history of affairs and murder.

This castle was once considered as an option for the Royal Family's alternate residence, but you may know it better from the 'X-Men' movie.