One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A century-old tradition has culminated in a small but singular collection of feline effigies.

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

Public access to clean drinking water was an instant hit among the masses.

Pop culture has helped to keep this iconic British building from being destroyed.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This hidden green space is the city's second largest conservatory.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

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

London's smallest police station is barely the size of a phone booth.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

Hear the quietest sound from across the dome.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

One part local history, 99 parts gruesome haunted house.