You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

A 550-square-meter micro-nation off the coast of Britain.

This antique prison is a tourist attraction with a sordid past.

The remains of the great moral philosopher reside in a university in London.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A kaleidoscopic warehouse-maze of handmade neon signs.

The world's largest collection of witchcraft regalia.

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

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

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

London's largest outsider art museum.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.