The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

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

A village on the east coast of England that has almost completely eroded into the North Sea.

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

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

Pop culture has helped to keep this iconic British building from being destroyed.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

The stately remains of Llywelyn the Great's mighty fortress.

This crumbling folly looks like an enchanted left over from Middle Earth.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

Three bridges straddle a stream, one stacked upon the other.

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

This abandoned asylum in Wales might look haunted, but it's still beautiful.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

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.

This Scottish bridge seems to compel dogs to leap to their death.

A clock designed to run with perfect accuracy for 10,000 years.

The remains of Crystal Palace Great Exhibition of 1851.

Remnants of a Victorian garden feature sitting in public woodland.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.