A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Hiding the longest subterranean river known in the world.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

The Devil’s own choice when he needs a drink in Brussels.

Lavish royal estate punctuated with heated greenhouses.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A fantastical bed and breakfast with magically unique rooms.

This modern labyrinth lies in the shadow of a ruined medieval castle.

Even after the church tried to wipe the practice out, this pagan festival lives on each year in a small Scottish village.

A fernery hidden by neglect is uncovered, and an ancient specimen along with it.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

A site of pagan worship which still attracts people looking for fairies.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

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

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Spend the night in this formerly abandoned traditional Scottish village.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This series of Scottish caves has no clear purpose other than baffling historians.

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

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.