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

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

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

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

These ornate arches show how the course of the River Thames has changed.

England's most famous front door has an accidental doppelganger.

Its collection includes a broad array of social, geographic, graphic design, and political history.

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

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

A cluttered and astounding collection of antiquities and curiosities.

The anatomical-pathological collection of a man who changed surgery.

The ground on which Shakespeare’s initial playhouse once stood.

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

This one has sailed five times as far as Sir Francis Drake's famous ship.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

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

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

The curios of pharmacist and collector Henry Wellcome.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.