6000-year-old site covered in more than 50 megaliths.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

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

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

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

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

19th century tunnels burrowed under Liverpool.

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

Picturesque ruins once held off mighty armies.

A hundred copies of Antony Gormley's naked body stare out across the water.

Each year a new straw behemoth is born.

This aging storage facility is the world's largest brick warehouse.