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

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

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

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

This luxury shopping lane has been protected by its own tiny police force for over a century.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

The largest stone circle in the world has ended up bringing up more questions than it has answered.

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

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

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.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Hear the quietest sound from across the dome.

Rebuilt remains of a temple to Roman god Mithras.

Famously misunderstood wonder of the ancient world

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

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