Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

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

A look into the life of a Victorian-era prisoner.

This mural honoring a drowned village has become a symbol of Welsh pride and patriotism.

This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

Tucked among the sand dunes overlooking a Welsh beach, a real-life tribute to a fictional elf.

Welsh literary history is preserved in the delicate pages of these medieval manuscripts.

A Welsh sheep farm provides daily (non-sheep) meals to red kites, producing dazzling displays of aerial acrobatics.

After years of slow decline, a derelict Gothic castle is now being restored to life.

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

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

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

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

A subterranean playground in an abandoned slate mine.