This crumbling folly looks like an enchanted left over from Middle Earth.

A geological wonder shrouded in myth.

The decaying ruins of Wales' first asylum for the mentally ill.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The site of an early Arthurian battle and the dwelling-place of prehistoric people and (possibly) an ancient race of giants.

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

The rust covering this old mine's abandoned buildings matches the red pigment it once produced.

A Victorian school for poverty stricken waifs has been preserved as a museum to their donated education.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

Open air sculptures by an eccentric and loin-clothed hermit.

You can soak in three relaxing pools filled daily by the tide.

A cheese discovery made by shepherds became the pride of a region.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

This underwater graveyard commemorates a group of murdered 16th-century missionaries.

An out-of-place grove of sequoias thrives in northern Spain.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

Giant granite sculptures representing family on the northern coast of Spain.