Even Henry David Thoreau found this glacial pothole irresistible.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

There are hundreds of secret WWII bases hidden in British forests. Built to fight a Nazi invasion, they remained unknown for decades.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A fantastic castle rumored to be the birthplace of King Arthur.

400-year-old garden, restored to beauty.

This tangled English forest looks like something right out of a fairytale.

Dictionary Johnson’s favorite feline.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

The largest greenhouse in the world is home to over one million types of plants.

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

A hands-off space for graffiti artists to hone and display their skills.

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

Surreal riveted sea forts once protected the Kent shores from German attack.

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

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

Famously misunderstood wonder of the ancient world

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The world's largest collection of witchcraft regalia.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.