This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

At high tide this strange footbridge appears to have no purpose whatsoever.

A subterranean playground in an abandoned slate mine.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

An artistic tribute to the famous singer, just around the corner from where he was born.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

The television series' iconic giant foot was borrowed from this classical painting.

This 1920s Dutch barge is now a floating bookstore.

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

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

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

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

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

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

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

The final resting place to 300 Victorian-era pets hides inside the city park.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

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