The perfectly preserved underground rooms where Churchill plotted the war against Germany.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

A statue of the original Pearly King is hidden in a church's crypt.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The television series' iconic giant foot was borrowed from this classical painting.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The final resting place of a German diplomat's beloved companion.

This 1920s Dutch barge is now a floating bookstore.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

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

A network of concealed passageways lies within a busy London Underground station.

The canine-themed book collection claims to be Europe's largest dog library.

The secret wartime bunker built on the platforms of an abandoned Tube station.

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