This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

This brilliant display of whirling fireballs celebrates Hogmanay.

A sea cave with a waterfall and Viking past

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

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

The ruins of a medieval monastery named after a type of tree.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

The oldest licensed distillery in Ireland.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

An unusual manor of stunning beauty, born out of a crippling disease.

A moody and picturesque riverside ruin overgrown with vegetation.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

One of Ireland's most infamous prisons for rebels including men, women and children.

The ancient tomb acts as a calendar that keeps perfect time.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Remnants of the rich history of fish salting in this ancient Mediterranean port town.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.