An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

The smallest pub in Britain was once a cabinet of curiosities and it still has the dead cat to prove it.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

A place of remembrance for the Prime Minister that met a violent end.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

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

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

The best place to acquire pea shooting fame.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

Human-made caves excavated to hide a secret society of wealthy pagans.

The oldest inn in England served brew to the crusaders.

Isaac Newton's former home, where the famous apple tree still stands.

This WWII aircraft museum presents its wrecks like taxidermy, complete with recreations of the crash sites.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Gothic tower where Lord Alfred Tennyson wrote the poem "The Sleeping Beauty."

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.