This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

Each year a new straw behemoth is born.

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

The remains of centuries of copper mining appear like an alien landscape.

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

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

The oldest working Brewery in Britain.

A preserved 18th century steel factory.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A 30-acre garden inspired by the principles of modern physics.

The largest preserved walking dragline excavator in Western Europe.

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