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

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

The Bristol Camera Obscura housed in an ancient windmill.

Unusual British home built to disguise a water tower.

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

A writer's tiny retreat built from salvaged shipwreck timbers.

A fantastic castle rumored to be the birthplace of King Arthur.

An ancient hotspot for spotting schools of fish.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

These upturned herring boats make nifty storage sheds for fishing goods.

The fences outside some of South London's estates are made from recycled World War II stretchers.

This historic Benedictine monastery brews a booze so toxic that it has often been blamed almost singularly for Scottish hooliganism.

Two women with a flair for both adventure and artful clutter created this singular round home.

It's possible to walk inside one of the largest Neolithic tombs in Britain.