Charles Babbage's proto-computer, painstakingly brought to life.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

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

Dictionary Johnson’s favorite feline.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Abstract dinosaur models in London.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

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

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

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

Enormous underground chamber built to detect 'ghost particles' of the universe.

Go through the looking glass in Tokyo's Wonderland-themed shop.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

Not quite the menace it once was, this monster still has some chops.

A 20-meter (65-foot) robot towers over Tokyo Bay.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.