A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

One of England's most famous churches hides a pair of little known architectural treasures.

This skewed English house has looked like it's going to fall over for centuries.

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

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

One of the oldest cathedrals in the U.K. houses a priceless early manuscript.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

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

The ritual has been performed uninterrupted for nearly 700 years.

The last four extravagant street signs of London's historic banking street.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

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

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

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

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

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

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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