One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

Largest lake in Great Britain measured by surface area.

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

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Abandoned ship reimagined as a street art canvas.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

Stroll through Welsh history in a village of reconstructed structures.

The longest and tallest aqueduct in Britain can actually be sailed across.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

These haunting ruins belong to an ancient village that once had one hell of a view.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Picturesque ruins once held off mighty armies.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

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

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Six neolithic sandstone boulders remaining from a dolmen.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

Prehistoric sandstone menhir with Early Bronze Age cup and ring markings, also known as Robin Hood's Stone.

Pyramid shaped monument with a tall tale attached.

A thousand year old oak tree survives in Liverpool.