The remains of Crystal Palace Great Exhibition of 1851.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

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

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

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

This coffee shop lies hidden beneath a historic church.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This hidden green space is the city's second largest conservatory.

Northern Ireland's Brobdingnagian stepping stones.

The longest hedge maze in the world.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

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

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

Remnants of a Victorian garden feature sitting in public woodland.

The atmospheric road was never meant to be so creepy.

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

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

An unusual round church in London with a Templar past.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Famously misunderstood wonder of the ancient world

A little slice of Japan and its aesthetics in London's Holland Park.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

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

A student driver's nightmare.