This home on a quiet suburban street is completely covered with vibrant mosaics.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

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

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

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.

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

The decaying ruins of Wales' first asylum for the mentally ill.

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

Remnants of a Victorian garden feature sitting in public woodland.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

An unusual round church in London with a Templar past.

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

Northern Ireland's Brobdingnagian stepping stones.

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

The world's largest collection of witchcraft regalia.

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

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.